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2017-01-12 20:07:37 -0500 asked a question What happened to my user name 10 years ago

I had a user name and password at http://sagenb.org 10 years ago and now even the bookmark is no good.

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2012-01-27 13:54:26 -0500 commented answer integrating with unspecified constants

Why doesn't "a = Constant('a')" work?

2012-01-21 10:36:24 -0500 commented answer integrating with unspecified constants

It works. The answer is simpler. Now all I have to do is check it. Thanks.

2012-01-21 08:49:12 -0500 asked a question integrating with unspecified constants

in the online sage I typed: var('x,a,b') integrate(1/sqrt(b+a/x), x)

And it answered: Traceback (click to the left of this block for traceback) ... Is b positive or negative?

Of course b is positive but there is no way to answer it's question or to predefine b as positive, so far as I know. so I used b^2 and got a question "Is b > 0?". Well yes b>0. So is a.

a and b are part of a physics problem. They change with the initial conditions. This is my first day with Sage. I have no idea what trace back is good for.

I don't know how to use this thing so send a copy of the answer to me at august04@frontier.com.