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Re: Adding equations

• To: mathgroup at smc.vnet.net
• Subject: [mg14447] Re: Adding equations
• From: "Dale Horton" <daleh>
• Date: Wed, 21 Oct 1998 03:32:43 -0400
• Organization: Wolfram Research, Inc.
• References: <703u1n$hup@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Thread[] will allow you to do this.

In[1]:=
eq1 = a==b
Out[1]=
a==b
In[2]:=
eq2 = c==d
Out[2]=
c==d
In[3]:=
Thread[eq1+eq2,Equal]
Out[3]=
a+c==b+d

-Dale

Lawrence Walker wrote in message <703u1n$hup at smc.vnet.net>...
>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
>
>