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MathGroup Archive 1998

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Re: Adding equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14418] Re: [mg14342] Adding equations
  • From: Garrett Tim Sos <gts at mindspring.com>
  • Date: Sun, 18 Oct 1998 15:10:19 -0400
  • References: <199810150428.AAA18222@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Try:

In:
e1 = a == b;
e2 = c == d;
e3 = Thread[e1+e2,Equal]

Out:
a+c==b+d


Tim


Lawrence Walker 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


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