Recent content by Feymar

Sorry for the late reply. I went to the library and also some more YT courses on the topic, that explain it more vividly thanks to animation, than a professor could. Of course, some things were just analogies to the abstractions that were happening. And I invested a lot into actually coming to...

My vocabulary is infinitely limited to express the gratitude I feel for your and the work you put in educating me and everybody else here. Thank you, and there is nothing to apologize, since you were completely right in the previous post, and I took it as constructive criticism, and actually sat...

Indeed. Thank you so much for you patience and time.

I understand here your counter argument, but since we (engineers in this program), were mainly thought to do second order partials from the first order partials, i.e. for Fxy and Fyx to exist, there must exist Fx and Fy and be differentiable, and since I thought that the existence Fxy and Fyx...

So here was my thought process: If second mixed partials are continuous, then they are equivalent. If second mixed partials are continuous, then the original function is C², and therefore continuous. Therefore, if the second mixed partials are equivalent, the function itself is continuous...

Apparently, according to this post: https://math.stackexchange.com/questions/2095484/clairauts-theorem-is-reversible?noredirect=1&lq=1 Clairaut-Schwarz Theorem is not reversible, i.e. equivalence of mixed partials does not prove a function to be continuous and an example was provided. What a...

I am aware of the examples provided, however, they talk about the mere existence of some or all partial derivatives, I am specifically asking if the equivalence of second partial mixed derivatives guarantees me, rigorously, that the function is continuous, in reference to the part of Schwarz's...

Hey folks, long story short, the Schwarz Theorem, that says that a continuous function has equivalent second partial (mixed) derivatives, can it be used "backwards", i.e. if I can show that the mixed partials are equivalent, that it proves that the function itself is continuous? And if not, why...

Oh, goodness me! I was dying over here trying to find a filter around the topic interface for keywords, while the huge "SEARCH" was quietly looming in the corner all the time, probably laughing at me and my incompetence to find things. Sorry for the nonsense topic of a seemingly blind mole-man...

Hey all, I have a few questions that I believe are not that uncommon, so I would like to search for the keywords on the topic on the various sub-forums, but in the filter-menu I can only search by poster and prefix? Is there no way to search for keywords? I truly believe that most of my...

Hello, I've googled my issue, but couldn't find some practical advice on the matter, rather some differences between Mechanical Engineering and Electrical Engineering in general. So, which one would be better if one wishes to work in the energy industry, namely Nuclear Energy, but maybe also...

Hello Everybody, I hope that I've picked the right sub-forum for my question. The problem is as follows: I understand perfectly well the proof by contradiction of the irrationality of the square root of 2, where we prove that if we assume that it is rational, then the integers of which the...

Hello folks, -Is it unusual that people start their university education in their mid twenties in the EU, and does it come with any handicaps, like additional fees , additional papperwork and similar? -Also, in your opinion, how does it affect carreers, given that the student did...