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MathGroup Archive 1998

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Re: Adding equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14415] Re: Adding equations
  • From: phbrf at t-online.de (Peter Breitfeld)
  • Date: Sun, 18 Oct 1998 15:10:17 -0400
  • Organization: das ist ein weites Feld ...
  • References: <703u1n$hup@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Lawrence Walker <lwalker701 at earthlink.net> schrieb/wrote:
> Group:
> 
> I've been trying to add two equations as follows:
> 
> In[4]:=
>     a==b;
> In[5]:=
>     c==d;
> In[6]:=
>     %4+%5
> Out[6]=
>     (a==b)+(c==d)
> 
> The result I was looking for is (a+c)==(b+d). The following works but it
> seems clumsy. In[7]:=
>     %4[[1]]+%5[[1]]==%4[[2]]+%5[[2]] Out[7]=
>     a+c==b+d
> Is there a way to elegantly add (sub, mult, div) two equations?  Also is
> there an elegant way to add (sub, mult, div) an expression to both
> sides of an equation?
> 
> Lawrence Walker
> 
> 


Try this:

In1: eq1= a==b; eq2= c==d;
In2: Thread[eq1+eq2,Equal] 
Out2: a+c==b+d

es gruesst
      Peter

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