How many distinct ways are there to traverse the edges of an N-dimensional hypercube?












2














I have an N-dimensional hypercube, and would like to traverse the edges so that I reach each vertex exactly once. One path that satisfies this property is known as the Gray code, but there are many others. How many such paths are there? Paths that can be mapped to each other by the symmetries of the hypercube may or may not be counted as distinct, depending on your preference.










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  • 2




    The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
    – Connor Harris
    Nov 29 '18 at 15:14












  • You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
    – Connor Harris
    Nov 29 '18 at 15:15












  • @ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
    – Display Name
    Nov 29 '18 at 15:42












  • Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
    – Mike
    Nov 29 '18 at 16:10








  • 1




    See OEIS sequences A003043 and A091299.
    – Robert Israel
    Nov 29 '18 at 18:31


















2














I have an N-dimensional hypercube, and would like to traverse the edges so that I reach each vertex exactly once. One path that satisfies this property is known as the Gray code, but there are many others. How many such paths are there? Paths that can be mapped to each other by the symmetries of the hypercube may or may not be counted as distinct, depending on your preference.










share|cite|improve this question


















  • 2




    The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
    – Connor Harris
    Nov 29 '18 at 15:14












  • You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
    – Connor Harris
    Nov 29 '18 at 15:15












  • @ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
    – Display Name
    Nov 29 '18 at 15:42












  • Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
    – Mike
    Nov 29 '18 at 16:10








  • 1




    See OEIS sequences A003043 and A091299.
    – Robert Israel
    Nov 29 '18 at 18:31
















2












2








2







I have an N-dimensional hypercube, and would like to traverse the edges so that I reach each vertex exactly once. One path that satisfies this property is known as the Gray code, but there are many others. How many such paths are there? Paths that can be mapped to each other by the symmetries of the hypercube may or may not be counted as distinct, depending on your preference.










share|cite|improve this question













I have an N-dimensional hypercube, and would like to traverse the edges so that I reach each vertex exactly once. One path that satisfies this property is known as the Gray code, but there are many others. How many such paths are there? Paths that can be mapped to each other by the symmetries of the hypercube may or may not be counted as distinct, depending on your preference.







combinatorics graph-theory






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share|cite|improve this question




share|cite|improve this question










asked Nov 29 '18 at 14:49









Display NameDisplay Name

2008




2008








  • 2




    The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
    – Connor Harris
    Nov 29 '18 at 15:14












  • You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
    – Connor Harris
    Nov 29 '18 at 15:15












  • @ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
    – Display Name
    Nov 29 '18 at 15:42












  • Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
    – Mike
    Nov 29 '18 at 16:10








  • 1




    See OEIS sequences A003043 and A091299.
    – Robert Israel
    Nov 29 '18 at 18:31
















  • 2




    The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
    – Connor Harris
    Nov 29 '18 at 15:14












  • You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
    – Connor Harris
    Nov 29 '18 at 15:15












  • @ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
    – Display Name
    Nov 29 '18 at 15:42












  • Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
    – Mike
    Nov 29 '18 at 16:10








  • 1




    See OEIS sequences A003043 and A091299.
    – Robert Israel
    Nov 29 '18 at 18:31










2




2




The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
– Connor Harris
Nov 29 '18 at 15:14






The name for what you're asking about is "Hamiltonian path." The short answer to your question is "a lot." According to this paper (ftp.inf.ethz.ch/doc/tech-reports/6xx/601.pdf), the number of Hamiltonian cycles on the $n$-dimensional hypercube $Q_n$ grows superexponentially; there are $6$ cycles (all automorphic) for $n = 3$, but for $n = 7$, the best known upper bound is about $2.5 times 10^{67}$. Note that every Hamiltonian cycle on $Q_n$ yields $2^n$ distinct paths by removing one edge of the cycle, and there are paths that can't be completed into cycles.
– Connor Harris
Nov 29 '18 at 15:14














You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
– Connor Harris
Nov 29 '18 at 15:15






You could try a more-or-less brute-force computer search, but I don't think this would be tractable beyond $n = 5$.
– Connor Harris
Nov 29 '18 at 15:15














@ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
– Display Name
Nov 29 '18 at 15:42






@ConnorHarris If only an upper bound is known, feel free to post that as an answer and I will accept it. Unless of course someone decides to announce their new result here. ;)
– Display Name
Nov 29 '18 at 15:42














Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
– Mike
Nov 29 '18 at 16:10






Well, $n!$ is an immediate lower bound; let $Q=u^0u^1ldots u^{2^n}$ be a Hamiltonian path on $H_n$ and let $pi$ be any permutation in $S_n$. Then let $pi(Q) = u^0v^1 ldots v^{2^n}$ be the Hamiltonian path specified as follows: let $k$ be such that $u^j$ and $u^{j+1}$ differ precisely in the $k$-th bit. Then $v^j$ and $v^{j+1}$ differ precisely in the $pi(k)$-th bit.
– Mike
Nov 29 '18 at 16:10






1




1




See OEIS sequences A003043 and A091299.
– Robert Israel
Nov 29 '18 at 18:31






See OEIS sequences A003043 and A091299.
– Robert Israel
Nov 29 '18 at 18:31












1 Answer
1






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This really is a sketch of a lower bound--but is too long for the comments



The lower bound for the number $X_n$ of Hamiltonian cycles in $H_n$ is at least something like $2^{2^n}$. In fact, $X_{n+1} geq 2^{2^n}X_n$.



Indeed, let $Q = v^0v^1ldots v^{2^n}$ be a Hamiltonian cycle in $H_{n}$. We will construct $2^{2^{n}}$ Hamilonian cycles in $H_{n+1}$ from $Q$.




  1. Let $w^0w^1 ldots w^{2^n}$ be vertices such that (a) the first $n$ bits of $w^i$ are the same as the first $n$ bits of $v^i$, but the $n+1$-th bit of $w^i$ is free (for $i=0,1,2, ldots, 2^n-1$). So $2^{2^n}$ ways to chose the $w^i$s.


  2. Let $H^i_2$ be the 4-vertex Hamiltonian path in the 4-vertex hypercube ${v^i,v^{i+1},v^i+ {bf{e}}_{n+1}, v^{i+1}+{bf{e}}_{n+1} }$ starting from $w^i$ and ending at $w^{i+1}$, where ${bf{e}}_l$ is the element where the $l$-th coordinate is 1 and the rest are all 0. [Note that $w^i in {v^i,v^i+ {bf{e}}_{n+1}}$, and $w^{i+1} in {v^{i+1},v^{i+1}+ {bf{e}}_{n+1}}$]


  3. Then let $Q$ be the Hamiltonian cycle consisting of the $H^i_2$s concatonated. This specifies $2^{2^n}$ distinct Hamiltoninan cycles in $H_{n+1}$ from one Hamiltonian cycle $Q$ in $H_n$. In fact, if $X_n$ is the number of Hamiltoninan cycles in $H_n$ then $X_{n+1} geq 2^{2^n} X_n$.





The (trivial) upper bound $U_n$ for the number of Hamiltonian cycles in $H_n$ is $n^{2^n} = 2^{2^n log n}$ (given the $i$-th vertex of the Hamiltonian cycle there are only at most $n$ choices for the $(i+1)$-th vertex), so letting $L_n$ be the lower bound derived above, we note that $log log U_n le log log L_n + log log n$.






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    This really is a sketch of a lower bound--but is too long for the comments



    The lower bound for the number $X_n$ of Hamiltonian cycles in $H_n$ is at least something like $2^{2^n}$. In fact, $X_{n+1} geq 2^{2^n}X_n$.



    Indeed, let $Q = v^0v^1ldots v^{2^n}$ be a Hamiltonian cycle in $H_{n}$. We will construct $2^{2^{n}}$ Hamilonian cycles in $H_{n+1}$ from $Q$.




    1. Let $w^0w^1 ldots w^{2^n}$ be vertices such that (a) the first $n$ bits of $w^i$ are the same as the first $n$ bits of $v^i$, but the $n+1$-th bit of $w^i$ is free (for $i=0,1,2, ldots, 2^n-1$). So $2^{2^n}$ ways to chose the $w^i$s.


    2. Let $H^i_2$ be the 4-vertex Hamiltonian path in the 4-vertex hypercube ${v^i,v^{i+1},v^i+ {bf{e}}_{n+1}, v^{i+1}+{bf{e}}_{n+1} }$ starting from $w^i$ and ending at $w^{i+1}$, where ${bf{e}}_l$ is the element where the $l$-th coordinate is 1 and the rest are all 0. [Note that $w^i in {v^i,v^i+ {bf{e}}_{n+1}}$, and $w^{i+1} in {v^{i+1},v^{i+1}+ {bf{e}}_{n+1}}$]


    3. Then let $Q$ be the Hamiltonian cycle consisting of the $H^i_2$s concatonated. This specifies $2^{2^n}$ distinct Hamiltoninan cycles in $H_{n+1}$ from one Hamiltonian cycle $Q$ in $H_n$. In fact, if $X_n$ is the number of Hamiltoninan cycles in $H_n$ then $X_{n+1} geq 2^{2^n} X_n$.





    The (trivial) upper bound $U_n$ for the number of Hamiltonian cycles in $H_n$ is $n^{2^n} = 2^{2^n log n}$ (given the $i$-th vertex of the Hamiltonian cycle there are only at most $n$ choices for the $(i+1)$-th vertex), so letting $L_n$ be the lower bound derived above, we note that $log log U_n le log log L_n + log log n$.






    share|cite|improve this answer




























      1














      This really is a sketch of a lower bound--but is too long for the comments



      The lower bound for the number $X_n$ of Hamiltonian cycles in $H_n$ is at least something like $2^{2^n}$. In fact, $X_{n+1} geq 2^{2^n}X_n$.



      Indeed, let $Q = v^0v^1ldots v^{2^n}$ be a Hamiltonian cycle in $H_{n}$. We will construct $2^{2^{n}}$ Hamilonian cycles in $H_{n+1}$ from $Q$.




      1. Let $w^0w^1 ldots w^{2^n}$ be vertices such that (a) the first $n$ bits of $w^i$ are the same as the first $n$ bits of $v^i$, but the $n+1$-th bit of $w^i$ is free (for $i=0,1,2, ldots, 2^n-1$). So $2^{2^n}$ ways to chose the $w^i$s.


      2. Let $H^i_2$ be the 4-vertex Hamiltonian path in the 4-vertex hypercube ${v^i,v^{i+1},v^i+ {bf{e}}_{n+1}, v^{i+1}+{bf{e}}_{n+1} }$ starting from $w^i$ and ending at $w^{i+1}$, where ${bf{e}}_l$ is the element where the $l$-th coordinate is 1 and the rest are all 0. [Note that $w^i in {v^i,v^i+ {bf{e}}_{n+1}}$, and $w^{i+1} in {v^{i+1},v^{i+1}+ {bf{e}}_{n+1}}$]


      3. Then let $Q$ be the Hamiltonian cycle consisting of the $H^i_2$s concatonated. This specifies $2^{2^n}$ distinct Hamiltoninan cycles in $H_{n+1}$ from one Hamiltonian cycle $Q$ in $H_n$. In fact, if $X_n$ is the number of Hamiltoninan cycles in $H_n$ then $X_{n+1} geq 2^{2^n} X_n$.





      The (trivial) upper bound $U_n$ for the number of Hamiltonian cycles in $H_n$ is $n^{2^n} = 2^{2^n log n}$ (given the $i$-th vertex of the Hamiltonian cycle there are only at most $n$ choices for the $(i+1)$-th vertex), so letting $L_n$ be the lower bound derived above, we note that $log log U_n le log log L_n + log log n$.






      share|cite|improve this answer


























        1












        1








        1






        This really is a sketch of a lower bound--but is too long for the comments



        The lower bound for the number $X_n$ of Hamiltonian cycles in $H_n$ is at least something like $2^{2^n}$. In fact, $X_{n+1} geq 2^{2^n}X_n$.



        Indeed, let $Q = v^0v^1ldots v^{2^n}$ be a Hamiltonian cycle in $H_{n}$. We will construct $2^{2^{n}}$ Hamilonian cycles in $H_{n+1}$ from $Q$.




        1. Let $w^0w^1 ldots w^{2^n}$ be vertices such that (a) the first $n$ bits of $w^i$ are the same as the first $n$ bits of $v^i$, but the $n+1$-th bit of $w^i$ is free (for $i=0,1,2, ldots, 2^n-1$). So $2^{2^n}$ ways to chose the $w^i$s.


        2. Let $H^i_2$ be the 4-vertex Hamiltonian path in the 4-vertex hypercube ${v^i,v^{i+1},v^i+ {bf{e}}_{n+1}, v^{i+1}+{bf{e}}_{n+1} }$ starting from $w^i$ and ending at $w^{i+1}$, where ${bf{e}}_l$ is the element where the $l$-th coordinate is 1 and the rest are all 0. [Note that $w^i in {v^i,v^i+ {bf{e}}_{n+1}}$, and $w^{i+1} in {v^{i+1},v^{i+1}+ {bf{e}}_{n+1}}$]


        3. Then let $Q$ be the Hamiltonian cycle consisting of the $H^i_2$s concatonated. This specifies $2^{2^n}$ distinct Hamiltoninan cycles in $H_{n+1}$ from one Hamiltonian cycle $Q$ in $H_n$. In fact, if $X_n$ is the number of Hamiltoninan cycles in $H_n$ then $X_{n+1} geq 2^{2^n} X_n$.





        The (trivial) upper bound $U_n$ for the number of Hamiltonian cycles in $H_n$ is $n^{2^n} = 2^{2^n log n}$ (given the $i$-th vertex of the Hamiltonian cycle there are only at most $n$ choices for the $(i+1)$-th vertex), so letting $L_n$ be the lower bound derived above, we note that $log log U_n le log log L_n + log log n$.






        share|cite|improve this answer














        This really is a sketch of a lower bound--but is too long for the comments



        The lower bound for the number $X_n$ of Hamiltonian cycles in $H_n$ is at least something like $2^{2^n}$. In fact, $X_{n+1} geq 2^{2^n}X_n$.



        Indeed, let $Q = v^0v^1ldots v^{2^n}$ be a Hamiltonian cycle in $H_{n}$. We will construct $2^{2^{n}}$ Hamilonian cycles in $H_{n+1}$ from $Q$.




        1. Let $w^0w^1 ldots w^{2^n}$ be vertices such that (a) the first $n$ bits of $w^i$ are the same as the first $n$ bits of $v^i$, but the $n+1$-th bit of $w^i$ is free (for $i=0,1,2, ldots, 2^n-1$). So $2^{2^n}$ ways to chose the $w^i$s.


        2. Let $H^i_2$ be the 4-vertex Hamiltonian path in the 4-vertex hypercube ${v^i,v^{i+1},v^i+ {bf{e}}_{n+1}, v^{i+1}+{bf{e}}_{n+1} }$ starting from $w^i$ and ending at $w^{i+1}$, where ${bf{e}}_l$ is the element where the $l$-th coordinate is 1 and the rest are all 0. [Note that $w^i in {v^i,v^i+ {bf{e}}_{n+1}}$, and $w^{i+1} in {v^{i+1},v^{i+1}+ {bf{e}}_{n+1}}$]


        3. Then let $Q$ be the Hamiltonian cycle consisting of the $H^i_2$s concatonated. This specifies $2^{2^n}$ distinct Hamiltoninan cycles in $H_{n+1}$ from one Hamiltonian cycle $Q$ in $H_n$. In fact, if $X_n$ is the number of Hamiltoninan cycles in $H_n$ then $X_{n+1} geq 2^{2^n} X_n$.





        The (trivial) upper bound $U_n$ for the number of Hamiltonian cycles in $H_n$ is $n^{2^n} = 2^{2^n log n}$ (given the $i$-th vertex of the Hamiltonian cycle there are only at most $n$ choices for the $(i+1)$-th vertex), so letting $L_n$ be the lower bound derived above, we note that $log log U_n le log log L_n + log log n$.







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        edited Nov 29 '18 at 19:48

























        answered Nov 29 '18 at 16:50









        MikeMike

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