mathwonk's latest activity

Interesting question. I haven't thought much about it, but if I understand, I think the point here is that, if one is given a unit...

As a humble engineer, I think there's both a counting bias and a decimal bias here. We are taught to think of numbers mainly as counts...

@Roberto Pavani: As a geometer, I share your point of view, as did Euclid. I.e. real numbers are essentially lengths on a line, (after...

I should have mentioned I was the original referee for Riemann's paper. Unfortunately I rejected it for lack of detail, but they...

Is it possible there are people today who think kids no longer need to know Euclidean geometry!? Or the Riemann - Roch theorem? Perhaps...

While increasingly rare, there are still situations where they still need to know how to write a check. Analogue clocks are still...

Welcome to PF. I recommend Michael Artin's book: Algebra, as a good guide to linear algebra and other topics in algebra. With your...

Courant, Differential and Integral Calculus, vol. 1, pp. 352-3.

(Apologies if some of this was already said while I was typing it out... had to leave and come back to it...) In most cases when a...

You flunked two semesters of community college? If I'm reading that right, that's not a good sign of potential success at this time...

If the z2- partial derivative of f at p is non -zero, then near p, on f=0, z2 is indeed a single valued function of z1; but if both...

I don't know if the argument for my statement is of interest, but it is nice and fairly short; namely, Riemann showed for analytic...

are z1, z2 complex variables? if so, the zeroes of an analytic function of 2 complex variables are never isolated.

It helps to have a definition of e. One definition is that e is the unique base such that the derivative of e^y at y=0 equals 1. Since...

short calc is a first course in calc, less than 300 pages, terse, no epsilonics. Undergrad analysis is a 3rd course in calc, very...