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 > >