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integrate problem

• To: mathgroup at smc.vnet.net
• Subject: [mg98837] integrate problem
• From: sean_incali at yahoo.com
• Date: Mon, 20 Apr 2009 05:39:59 -0400 (EDT)

I'm having some issues understanding this...  Following works as
expected.

s is the variable in time.  a is a parameter.

Integrate[1/(s + a), s]

gives Log[a + s]

But the following gives the integral itself.

Integrate[1/(s[t] + a), t]

If the function that needs to be integrated w.r.t time is 1/(s[t] +
a), how do I accomplish that?  It seems like if integrate it wrt to s
[t] it will work.

Integrate[1/(s[t] + a), s[t]]


But does that sound about right?

Any thoughts appreciated.

Sean

• Follow-Ups:
  • Re: integrate problem
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: integrate problem
    • From: Lou Talman <talmanl@mscd.edu>