Modifying equations
- To: mathgroup at smc.vnet.net
- Subject: [mg59135] Modifying equations
- From: "Kalle Rutanen" <kalle_rutanen at nospam.hotmail.com>
- Date: Sat, 30 Jul 2005 01:25:07 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello
My intention is to write a mathematical paper which derives results step by
step. So here is my first question:
Given the equations
eqn1 = a == b
eqn2 = c == d
How can I combine these to form (for example)
a + c == b + d ?
I tried the obvious eqn1 + eqn2, but that does not seem to work...
Second question:
Given this:
Sum[a_i, {i, 0, n}] + Sum[b_i, {i, 0, n}]
How can I make Mathematica combine the sums giving:
Sum[a_i + b_i, {i, 0, n}] ?
Thanks.