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 May 6 awarded Commentator May 6 comment WolframAlpha blows simple substitution? My derivative may be wrong - I will check that right away - but I didn't ask WolframAlpha to calculate the derivative, I asked it to calculate my formula for the derivative for a given n. May 6 asked WolframAlpha blows simple substitution? May 5 awarded Scholar May 5 accepted Doubt about function value (expected undefined, but Wolframalpha says otherwise) May 5 comment Doubt about function value (expected undefined, but Wolframalpha says otherwise) Actually, our Prof is very thorough when it comes to those kind of things, I just wasn't sure if it was actually ok to fix the singularity in this case... May 5 comment Doubt about function value (expected undefined, but Wolframalpha says otherwise) Can I just do it like that? Granted, the original function is continuous at $-1/3$ so I can probably do that in this case, but are such things ok in general? May 5 comment Doubt about function value (expected undefined, but Wolframalpha says otherwise) 1 + (12x+4)/((x+1)^2) * (12/(12x+4) - 2/(x+1)), x=-1/3 May 5 asked Doubt about function value (expected undefined, but Wolframalpha says otherwise) Apr 24 comment Proving properties of a simple undirected graph Damn - I didn't think it would be that simple. But yeah, now that you mention it... I just noticed we even have a Lemma with which this can be written even shorter. Thanks a lot, I really had a blockade on that one. Apr 24 asked Proving properties of a simple undirected graph Apr 8 comment Proving a simple inequality. Well, my homeworks are corrected by the assistants of my prof, but I'm pretty sure that what they're more interested in is reducing the problem to one that has a reasonably obvious solution. If I was to prove 'everything' I would have to go back to the peano axioms every time I wanted to add 2 natural numbers. I don't think that's in anyones interest here. Apr 8 comment Proving a simple inequality. That's supposed to be the proof for the monotocity of a series, so using the monotocity of a function for that would be kinda weird. Apr 8 comment Proving a simple inequality. Isn't $4n^2 +4n -1 > 0$ already enough, given that $n\in\mathbb{N}$? Apr 8 comment Proving a simple inequality. Oh, I see what you did there. Apr 8 comment Proving a simple inequality. Ok, then my thinking was wrong, but the solution in this case correct? Thank you very much. Oh you just removed the second part. So was that invalid? Apr 8 awarded Student Apr 8 asked Proving a simple inequality.