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2017-07-14 18:49:53 +0200 received badge  Scholar (source)
2017-07-14 10:55:33 +0200 commented question Why am I getting a wrong answer for this sum?

Want to add that as an answer?

2017-07-13 15:27:20 +0200 asked a question Why am I getting a wrong answer for this sum?

I'm trying to simplify a sum with some minima in it. I started with this.

sum(i, i, 0, min(k-1, la+lb))

1/2k^2 - 1/2k

Doesn't look good. What am I doing wrong?