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Redefining symbol midway through a document

1

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

edited 4 hours ago

Sergestus

asked 4 hours ago

SergestusSergestus

204

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes: using phi` when you want it, and `varphi`` when it is the one you need.
  
  – Bernard
  4 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
  4 hours ago
  

  
  
  
  

add a comment | 

1

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

edited 4 hours ago

Sergestus

asked 4 hours ago

SergestusSergestus

204

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes: using phi` when you want it, and `varphi`` when it is the one you need.
  
  – Bernard
  4 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
  4 hours ago
  

  
  
  
  

add a comment | 

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

edited 4 hours ago

Sergestus

asked 4 hours ago

SergestusSergestus

204

documentclass{article}

usepackage{amsmath, amssymb}



newcommand{oldphi}{phi}

renewcommand{phi}{varphi}



begin{document}

$phi$

renewcommand{phi}{oldphi}

$phi$

end{document}

share|improve this question

edited 4 hours ago

Sergestus

asked 4 hours ago

SergestusSergestus

204

share|improve this question

edited 4 hours ago

Sergestus

asked 4 hours ago

SergestusSergestus

204

asked 4 hours ago

SergestusSergestus

204

asked 4 hours ago

SergestusSergestus

204

2 Answers
2

active

oldest

votes

3

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} 

share|improve this answer

answered 3 hours ago

BernardBernard

175k776207

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great! I had just reached the same conclusion below, thanks!
  
  – Sergestus
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh! I see. Great minds think together! :o)
  
  – Bernard
  3 hours ago
  

  
  
  
  

add a comment | 

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

answered 3 hours ago

SergestusSergestus

204

add a comment | 

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3

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} 

share|improve this answer

answered 3 hours ago

BernardBernard

175k776207

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great! I had just reached the same conclusion below, thanks!
  
  – Sergestus
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh! I see. Great minds think together! :o)
  
  – Bernard
  3 hours ago
  

  
  
  
  

add a comment | 

3

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} 

share|improve this answer

answered 3 hours ago

BernardBernard

175k776207

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great! I had just reached the same conclusion below, thanks!
  
  – Sergestus
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh! I see. Great minds think together! :o)
  
  – Bernard
  3 hours ago
  

  
  
  
  

add a comment | 

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} 

share|improve this answer

answered 3 hours ago

BernardBernard

175k776207

documentclass{article}

usepackage{amsmath, amssymb}



letoldphi=phi

letphi=varphi 



begin{document}



$phi$



letphi=oldphi

$phi$



letphi=varphi 

$phi$



letphi=oldphi

$phi$



end{document} 

share|improve this answer

answered 3 hours ago

BernardBernard

175k776207

answered 3 hours ago

BernardBernard

175k776207

answered 3 hours ago

BernardBernard

175k776207

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

answered 3 hours ago

SergestusSergestus

204

add a comment | 

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

answered 3 hours ago

SergestusSergestus

204

add a comment | 

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

answered 3 hours ago

SergestusSergestus

204

documentclass{article}

usepackage{amsmath, amssymb}



letoldphiphi

letphivarphi



begin{document}

$phi$

letphioldphi

$phi$

end{document}

share|improve this answer

answered 3 hours ago

SergestusSergestus

204

answered 3 hours ago

SergestusSergestus

204

answered 3 hours ago

SergestusSergestus

204