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

**References**:**Adding equations***From:*Lawrence Walker <lwalker701@earthlink.net>