Redefining symbol midway through a document












2















I am trying to have one command (phi) draw two different symbols (varphi and regular phi) in the same document.



I have tried this with the below:



documentclass{article}

usepackage{amsmath, amssymb}



newcommand{oldphi}{phi}

renewcommand{phi}{varphi}



begin{document}

$phi$

renewcommand{phi}{oldphi}

$phi$

end{document}


But this wont compile (with pdftex or TexMaker), it seem like it gets stuck in a loop and wont create a pdf, but I can't see why?



Or is there a better way to achieve this?






math-mode macros pdftex symbols







share|improve this question

























  • Yes: using phi` when you want it, and `varphi`` when it is the one you need.

    – Bernard
    5 hours ago











  • @Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

    – Sergestus
    5 hours ago
















2















I am trying to have one command (phi) draw two different symbols (varphi and regular phi) in the same document.



I have tried this with the below:



documentclass{article}

usepackage{amsmath, amssymb}



newcommand{oldphi}{phi}

renewcommand{phi}{varphi}



begin{document}

$phi$

renewcommand{phi}{oldphi}

$phi$

end{document}


But this wont compile (with pdftex or TexMaker), it seem like it gets stuck in a loop and wont create a pdf, but I can't see why?



Or is there a better way to achieve this?






math-mode macros pdftex symbols







share|improve this question

























  • Yes: using phi` when you want it, and `varphi`` when it is the one you need.

    – Bernard
    5 hours ago











  • @Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

    – Sergestus
    5 hours ago














2












2








2








I am trying to have one command (phi) draw two different symbols (varphi and regular phi) in the same document.



I have tried this with the below:



documentclass{article}

usepackage{amsmath, amssymb}



newcommand{oldphi}{phi}

renewcommand{phi}{varphi}



begin{document}

$phi$

renewcommand{phi}{oldphi}

$phi$

end{document}


But this wont compile (with pdftex or TexMaker), it seem like it gets stuck in a loop and wont create a pdf, but I can't see why?



Or is there a better way to achieve this?






math-mode macros pdftex symbols







share|improve this question
















I am trying to have one command (phi) draw two different symbols (varphi and regular phi) in the same document.



I have tried this with the below:



documentclass{article}

usepackage{amsmath, amssymb}



newcommand{oldphi}{phi}

renewcommand{phi}{varphi}



begin{document}

$phi$

renewcommand{phi}{oldphi}

$phi$

end{document}


But this wont compile (with pdftex or TexMaker), it seem like it gets stuck in a loop and wont create a pdf, but I can't see why?



Or is there a better way to achieve this?






math-mode macros pdftex symbols




math-mode macros pdftex symbols






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 5 hours ago







Sergestus

















asked 6 hours ago









SergestusSergestus

254




254













  • Yes: using phi` when you want it, and `varphi`` when it is the one you need.

    – Bernard
    5 hours ago











  • @Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

    – Sergestus
    5 hours ago



















  • Yes: using phi` when you want it, and `varphi`` when it is the one you need.

    – Bernard
    5 hours ago











  • @Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

    – Sergestus
    5 hours ago

















Yes: using phi` when you want it, and `varphi`` when it is the one you need.

– Bernard
5 hours ago





Yes: using phi` when you want it, and `varphi`` when it is the one you need.

– Bernard
5 hours ago













@Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

– Sergestus
5 hours ago





@Bernard I know that's the simplest way to do it really, but it would mean writing way to many extra letters :P

– Sergestus
5 hours ago










2 Answers
2






active

oldest

votes


















4














With let, it works:



documentclass{article}

usepackage{amsmath, amssymb}



letoldphi=phi

letphi=varphi 



begin{document}



$phi$



letphi=oldphi

$phi$



letphi=varphi 

$phi$



letphi=oldphi

$phi$



end{document}


enter image description here






share|improve this answer
























  • Great! I had just reached the same conclusion below, thanks!

    – Sergestus
    5 hours ago






  • 1





    Oh! I see. Great minds think together! :o)

    – Bernard
    5 hours ago



















0














I have solved this myself using let and so post this for posterity.



documentclass{article}

usepackage{amsmath, amssymb}



letoldphiphi

letphivarphi



begin{document}

$phi$

letphioldphi

$phi$

end{document}


My understanding is that newcommand{x}{y} simply replaces "a" with "b" so can become circular, whereas letab actually sets a to the value of b, so resolves any self-referencing issues.






share|improve this answer
























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    2 Answers
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    2 Answers
    2






    active

    oldest

    votes









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    oldest

    votes






    active

    oldest

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    4














    With let, it works:



    documentclass{article}
    
usepackage{amsmath, amssymb}
    

    
letoldphi=phi
    
letphi=varphi 
    

    
begin{document}
    

    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
letphi=varphi 
    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
end{document}


    enter image description here






    share|improve this answer
























    • Great! I had just reached the same conclusion below, thanks!

      – Sergestus
      5 hours ago






    • 1





      Oh! I see. Great minds think together! :o)

      – Bernard
      5 hours ago
















    4














    With let, it works:



    documentclass{article}
    
usepackage{amsmath, amssymb}
    

    
letoldphi=phi
    
letphi=varphi 
    

    
begin{document}
    

    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
letphi=varphi 
    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
end{document}


    enter image description here






    share|improve this answer
























    • Great! I had just reached the same conclusion below, thanks!

      – Sergestus
      5 hours ago






    • 1





      Oh! I see. Great minds think together! :o)

      – Bernard
      5 hours ago














    4












    4








    4







    With let, it works:



    documentclass{article}
    
usepackage{amsmath, amssymb}
    

    
letoldphi=phi
    
letphi=varphi 
    

    
begin{document}
    

    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
letphi=varphi 
    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
end{document}


    enter image description here






    share|improve this answer













    With let, it works:



    documentclass{article}
    
usepackage{amsmath, amssymb}
    

    
letoldphi=phi
    
letphi=varphi 
    

    
begin{document}
    

    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
letphi=varphi 
    
$phi$
    

    
letphi=oldphi
    
$phi$
    

    
end{document}


    enter image description here







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 5 hours ago









    BernardBernard

    175k776207




    175k776207













    • Great! I had just reached the same conclusion below, thanks!

      – Sergestus
      5 hours ago






    • 1





      Oh! I see. Great minds think together! :o)

      – Bernard
      5 hours ago



















    • Great! I had just reached the same conclusion below, thanks!

      – Sergestus
      5 hours ago






    • 1





      Oh! I see. Great minds think together! :o)

      – Bernard
      5 hours ago

















    Great! I had just reached the same conclusion below, thanks!

    – Sergestus
    5 hours ago





    Great! I had just reached the same conclusion below, thanks!

    – Sergestus
    5 hours ago




    1




    1





    Oh! I see. Great minds think together! :o)

    – Bernard
    5 hours ago





    Oh! I see. Great minds think together! :o)

    – Bernard
    5 hours ago











    0














    I have solved this myself using let and so post this for posterity.



    documentclass{article}
    
usepackage{amsmath, amssymb}
    

    
letoldphiphi
    
letphivarphi
    

    
begin{document}
    
$phi$
    
letphioldphi
    
$phi$
    
end{document}


    My understanding is that newcommand{x}{y} simply replaces "a" with "b" so can become circular, whereas letab actually sets a to the value of b, so resolves any self-referencing issues.






    share|improve this answer




























      0














      I have solved this myself using let and so post this for posterity.



      documentclass{article}
      
usepackage{amsmath, amssymb}
      

      
letoldphiphi
      
letphivarphi
      

      
begin{document}
      
$phi$
      
letphioldphi
      
$phi$
      
end{document}


      My understanding is that newcommand{x}{y} simply replaces "a" with "b" so can become circular, whereas letab actually sets a to the value of b, so resolves any self-referencing issues.






      share|improve this answer


























        0












        0








        0







        I have solved this myself using let and so post this for posterity.



        documentclass{article}
        
usepackage{amsmath, amssymb}
        

        
letoldphiphi
        
letphivarphi
        

        
begin{document}
        
$phi$
        
letphioldphi
        
$phi$
        
end{document}


        My understanding is that newcommand{x}{y} simply replaces "a" with "b" so can become circular, whereas letab actually sets a to the value of b, so resolves any self-referencing issues.






        share|improve this answer













        I have solved this myself using let and so post this for posterity.



        documentclass{article}
        
usepackage{amsmath, amssymb}
        

        
letoldphiphi
        
letphivarphi
        

        
begin{document}
        
$phi$
        
letphioldphi
        
$phi$
        
end{document}


        My understanding is that newcommand{x}{y} simply replaces "a" with "b" so can become circular, whereas letab actually sets a to the value of b, so resolves any self-referencing issues.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 5 hours ago









        SergestusSergestus

        254




        254






























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