Recent content by Steve Zissou

Thanks @dextercioby !

Ok I kid you not on this one: Integrate[t^(z-1)*Exp[-t],{t,0,\infty}] Yields the answer: Try the following: Use different phrasing or notations Enter whole words instead of abbreviations Avoid mixing mathematical and other notations Check your spelling Give your input in English

I'm not sure how to tell WolframAlpha if certain variables are complex, real, or any sort of bounds on parameters.

@BWV Ok that's unexpected. I've had AI give some wacky math answers so I haven't tried using that tech for a while for math.

@vela Whoa that's unexpected. So it will do it, but there is some resource limits that I was unaware of?

Cool!

Well that's weird.

Hi everyone, I thought I would share a thought - apparently simple problems that Wolfram can't seem to handle. I'll go first: $$ \int_{0}^{\infty}e^{-x^p}dx=\frac{1}{p}\Gamma\left( \frac{1}{p} \right) $$ Entering this into Wolfram alpha: Integrate[Exp[-x^p],{x,0,\infty}] Gets you nowhere. Ha...

Update: I found this paper: "The Convolution of the Normal and Lognormal Distributions," Hawkins, South African Statistical Journal (1991) 25, 99-128 In the paper, Hawkins presents the problem as I did, but also using the transformation suggested by @renormalize . Then Hawkins goes on to say...

Yep

Data: 1 lb of Cu There are 453.592 grams in a pound the density of Cu is 8.94 g per cubic cm 1 cubic centimeter is 0.03102 cubic inches Calculation: $$ \left( 1\,lb\, Cu \right)\left(\frac{453.592\,g\,Cu}{1\,lb\,Cu}\right)\left( \frac{1\,cm^3}{8.94\,g\,Cu} \right)\left(...

Thank you, renormalize! I am familiar with that somewhat cryptic paper. Also I have been mostly unsuccessful in finding more discussion out there of the NLM distribution. Anyways I like your substitution which sets aside one parameter, that's nice. It's the darn double-exponential that seems to...

Thank you phyzguy! I think you've go the right idea. Still, it seems strange to me that such familiar functions haven't been examined in this way before.

Looks like Wolfram Alpha can't do it, nor are there any published tables anywhere that have been helpful. That's why I'm enlisting the help of my friends here. Any ideas would be warmly appreciated.

Right on, baby