A word of length 4 in a local group, with two different values












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I've been told that in a local group, one can find a word of length of $n=4$, i.e $w=g_1 g_2 g_3 g_4$, with two different meanings depending on how we put the parentheses. However I've also read that a well defined word has only one value, which means that I'm looking a word which is not well defined.



Can anyone give me a hint of such an example, or tell me whether my understanding of these basic facts is true?










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  • Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
    – C Monsour
    Nov 27 at 18:38










  • I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
    – Keen-ameteur
    Nov 27 at 18:45










  • In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
    – C Monsour
    Nov 27 at 23:42
















0














I've been told that in a local group, one can find a word of length of $n=4$, i.e $w=g_1 g_2 g_3 g_4$, with two different meanings depending on how we put the parentheses. However I've also read that a well defined word has only one value, which means that I'm looking a word which is not well defined.



Can anyone give me a hint of such an example, or tell me whether my understanding of these basic facts is true?










share|cite|improve this question






















  • Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
    – C Monsour
    Nov 27 at 18:38










  • I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
    – Keen-ameteur
    Nov 27 at 18:45










  • In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
    – C Monsour
    Nov 27 at 23:42














0












0








0







I've been told that in a local group, one can find a word of length of $n=4$, i.e $w=g_1 g_2 g_3 g_4$, with two different meanings depending on how we put the parentheses. However I've also read that a well defined word has only one value, which means that I'm looking a word which is not well defined.



Can anyone give me a hint of such an example, or tell me whether my understanding of these basic facts is true?










share|cite|improve this question













I've been told that in a local group, one can find a word of length of $n=4$, i.e $w=g_1 g_2 g_3 g_4$, with two different meanings depending on how we put the parentheses. However I've also read that a well defined word has only one value, which means that I'm looking a word which is not well defined.



Can anyone give me a hint of such an example, or tell me whether my understanding of these basic facts is true?







group-theory topological-groups






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asked Nov 27 at 11:15









Keen-ameteur

1,257316




1,257316












  • Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
    – C Monsour
    Nov 27 at 18:38










  • I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
    – Keen-ameteur
    Nov 27 at 18:45










  • In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
    – C Monsour
    Nov 27 at 23:42


















  • Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
    – C Monsour
    Nov 27 at 18:38










  • I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
    – Keen-ameteur
    Nov 27 at 18:45










  • In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
    – C Monsour
    Nov 27 at 23:42
















Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
– C Monsour
Nov 27 at 18:38




Even a word of length 3 can have two different meanings in a local group if one of them is a value and the other is "not defined". Do you perhaps mean that a word of length 4 can have two different values rather than just two different meanings?
– C Monsour
Nov 27 at 18:38












I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
– Keen-ameteur
Nov 27 at 18:45




I meant two different values, but I'm unsure as to why there is a difference? Assuming that every choice of parentheses is defined, doesn't local associativity imply a unique value?
– Keen-ameteur
Nov 27 at 18:45












In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
– C Monsour
Nov 27 at 23:42




In a local group, ab and (ab)c may be defined without bc being defined. That's why there's a difference.
– C Monsour
Nov 27 at 23:42















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