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Adding equations


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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