Mark Eichenlaub
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 Nov9 awarded Yearling Jul10 awarded Nice Answer Jun8 awarded Nice Answer Mar12 accepted Why can't we interchange differentiation with taking a limit of a series of functions? Feb20 awarded Nice Answer Feb13 comment Singing Bird Problem @BrianM.Scott Yes, you're right, thanks. Tried a new answer. Feb13 revised Singing Bird Problem added 288 characters in body Feb13 answered Singing Bird Problem Jan30 awarded Necromancer Jan22 comment Can there be a cubical bubble? @Rahul Ah, now I see. What I meant is that the performer made a roughly cubical compartment, but it is not perfect. I wanted to know if a perfect cube was mathematically possible, or whether, for example, the corners would always be a little rounded off. Jan21 comment Can there be a cubical bubble? Great answer! Thanks for all the references. Jan21 comment Can there be a cubical bubble? @Rahul Yup, that's what I wanted to know. I just don't really understand how your comment addressed the question. I think there is something about it I'm missing. (I'm not a mathematician.) Will Jagy's answer was pretty much what I wanted. Jan21 comment Can there be a cubical bubble? @Rahul I don't understand, sorry. How does this address whether or not there can be a cubical bubble? Jan21 asked Can there be a cubical bubble? Jan12 comment How many ways can $b$ balls be distributed in $c$ containers with no more than $n$ balls in any given container? Thank you. Yes, that was how I got that identity. Jan11 accepted How many ways can $b$ balls be distributed in $c$ containers with no more than $n$ balls in any given container? Jan11 asked How many ways can $b$ balls be distributed in $c$ containers with no more than $n$ balls in any given container? Dec17 comment Fourier transform for dummies Thanks! I will check it out. Nov25 comment Point me the primordial and intuitive concepts about this operations on physics For an intro to EM, "Electricity and Magnetism" by Purcell is what I used. It was great. Nov25 comment Point me the primordial and intuitive concepts about this operations on physics Well, I'm a physicist and I think I understand electric charge pretty well, but that page still doesn't make sense to me. I suggest finding a better resource.