RE: Adding equations

*To*: mathgroup at smc.vnet.net*Subject*: [mg14388] RE: [mg14342] Adding equations*From*: "Ersek, Ted R" <ErsekTR at navair.navy.mil>*Date*: Sun, 18 Oct 1998 15:09:55 -0400*Sender*: owner-wri-mathgroup at wolfram.com

Lawrence Walker wrote: > >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) >........... >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? > In the first two lines I add and mult two equations. In the third line I add an expression to both sides of an equation. I haven't found a way to deal with division. In[6]:= Thread[%4+%5,Equal] Out[6]= a+c==b+d In[7]:= Thread[%4 %5,Equal] Out[7]= a c==b d In[8]:= Map[#+x&,%4] Out[8]= a+x==b+x Cheers, Ted Ersek