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MathGroup Archive 2007

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Re: Hold and Equal

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73796] Re: Hold and Equal
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 28 Feb 2007 04:42:34 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <erufqm$s7j$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi Murray,

(HoldForm @@ {(a + b)^2 == Expand[(a + b)^2]}) /. Equal -> Set

Regards
   Jens

Murray Eisenberg wrote:
> How can I produce in an Output cell (under program control) an 
> expression like the following,
> 
>    (a+b)^2 = a^2+ 2 a b + b^2
> 
> where instead of the usual Equal (==) I get a Set (=), as in traditional 
> math notation?  I want to input the unexpanded (a+b)^2 and have the 
> expansion done automatically.
> 
> Of course, I can try something like the following:
> 
>    (a+b)^2 == Expand[(a+b)^2])
> 
> So how do I convert the == to =?  Of course
> 
>    ((a + b)^2 == Expand[(a + b)^2]) /. Equal -> Set
> 
> gives a Set::write error.  And
> 
>    (Hold[(a + b)^2 == Expand[(a + b)^2]]) /. Equal -> Set
> 
> doesn't actually evaluate the Expand part and leaves the "Hold" wrapper.
> 
> 
> 
> 


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