Brennan Vincent
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 Jan27 awarded Revival Dec18 comment Opposite of a function being bijective? Downvoted because of the phrasing "of course not", which is overly aggressive for a question asked in good faith by a potential beginner. May29 comment Given a skewed ellipse, how to determine its axis lengths? Thanks; upvoted. It appears that the solutions for 2x2 SVDs are complicated masses of C code -- there aren't any explicit formulas for this? May29 asked Given a skewed ellipse, how to determine its axis lengths? Jan3 awarded Student May29 awarded Teacher May29 comment practical uses of matrix multiplication I don't understand what you mean by row and column indices being comparable to "input" and "output". May29 answered closed set in another closed set May25 comment Flip a coin until a head comes up. Why is “infinitely many tails” an event we need to consider? How in the world does every event have non-zero probability? -1 Jan6 comment Why do books titled “Abstract Algebra” mostly deal with groups/rings/fields? You're missing a right parenthesis in the first paragraph. Dec29 comment Do infinity and zero really exist? Infinity is not normally considered a number (what it is depends on the context... for example, if a limit is infinity, "infinity" describes the long-term behavior of a function.) Besides this technical nitpick, you're answer is absolutely correct and should be accepted. Aug7 awarded Critic Aug7 awarded Scholar Aug7 awarded Supporter Aug7 comment Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is? Thanks for the concise and correct answer! Aug7 accepted Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is? Aug7 asked Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is?