How to Extract a common factor from a Sum
- To: mathgroup at smc.vnet.net
- Subject: [mg12882] How to Extract a common factor from a Sum
- From: loewenthal at iap.unibe.ch (Frank Loewenthal)
- Date: Wed, 24 Jun 1998 03:44:08 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Hi Folks
I have a symbolical sum like
expr = Sum[ a f[k], {k,1,N}] and I want to force Mathematica to write
this as
expr = a Sum[f[k], {k,1,N}]
What ever I tried it did not work.
Does anyone knows a solution?
Thanks in advance
Frank