Is there a differentiable function f(x) such that the derivative is nowhere continuous? That is, f'(x) has no point of continuity? [more inside]
posted by thrako on Aug 1, 2008 - 16 answers

I'm thinking of creating an ebook that is a workbook companion for an existing popular investment book. What copyright issues do I have to consider? For example, can I title it "The [Investment Book Title] Workbook?" Can I do it at all without getting permission first?
posted by SampleSize on Mar 28, 2008 - 7 answers

Can anyone explain, in some detail, precisely *how* the taking and use of a screenshot of a program running on a computer can infringe the copyrights or trademarks of others? [more inside]
posted by baylink on Jan 23, 2007 - 19 answers

Stupid calculus question inside. [more inside]
posted by killdevil on Jul 19, 2006 - 15 answers