Still, the solution methods are pretty similar.) (Also, on looking at Wikipedia some more I see that this is actually technically a separable partial differential equation, whereas the AP problem is a separable ordinary differential equation. In cylindrical coordinates, the equations are slightly different and lead to plane waves defined by the Bessel functions, although this differential equation is not separable. ![]() In Cartesian coordinates this leads to three sets of sinusoids which in the problems I solve define plane waves. Which happens in certain physical situations (namely, when f lines up with the coordinate system you're using). This is separable so long as you can rewrite f(x, y, z) = X(x)Y(y)Z(z) There's some ODEs referred to as "separable" in my field that are of the form: aX''(x)Y(y)Z(z) + bX(x)Y''(y)Z(z) + cX(x)Y(y)Z''(z) = f(x, y, z) Separable equations? To be honest I'm not really terribly familiar with the names of some of them, because I'm an engineer and not a mathematician. TeX all the things Chrome extension (configure inline math to use delimiters) MathJax userscript (userscripts need Greasemonkey, Tampermonkey or similar) To view LaTeX on reddit, install one of the following: If you feel you were banned unjustly, or that the circumstances of your ban no longer apply, see our ban appeal process here.Ĭareer and Education Questions - every ThursdayĪ Compilation of Free, Online Math Resources. If you post or comment something breaking the rules, the content may be removed - repeated removal violations may escalate to a ban, but not without some kind of prior warning see here for our policy on warnings and bans. ![]() This subreddit is actively moderated to maintain the standards outlined above as such, posts and comments are often removed and redirected to a more appropriate location. Unnecessarily combative or unkind comments may result in an immediate ban. racism, sexism, homophobia, hate speech, etc.). This includes not only comments directed at users of /r/math, but at any person or group of people (e.g. If you upload an image or video, you must explain why it is relevant by posting a comment providing additional information that prompts discussion.ĭo not troll, insult, antagonize, or otherwise harass. Memes and similar content are not permitted. Image/Video posts should be on-topic and should promote discussion. If you are asking for advice on choosing classes or career prospects, please post in the stickied Career & Education Questions thread. Rule 4: No career or education related questions If you ask for help cheating, you will be banned. ![]() Do not ask or answer this type of question in /r/math. Homework problems, practice problems, and similar questions should be directed to /r/learnmath, /r/homeworkhelp or /r/cheatatmathhomework. This includes reference requests - also see our list of free online resources and recommended books. ![]() If you're asking for help learning/understanding something mathematical, post in the Quick Questions thread or /r/learnmath. Requests for calculation or estimation of real-world problems and values are best suited for the Quick Questions thread, /r/askmath or /r/theydidthemath. For example, if you think your question can be answered quickly, you should instead post it in the Quick Questions thread. Questions on /r/math should spark discussion. Rule 2: Questions should spark discussion Please avoid derailing such discussions into general political discussion, and report any comments that do so. In particular, any political discussion on /r/math should be directly related to mathematics - all threads and comments should be about concrete events and how they affect mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.Īll posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics. This subreddit is for discussion of mathematics.
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