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visits member for 3 years, 11 months
seen Jun 3 at 21:42

May
29
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?
May
29
asked Given a skewed ellipse, how to determine its axis lengths?
Jan
3
awarded  Student
May
29
awarded  Teacher
May
29
comment practical uses of matrix multiplication
I don't understand what you mean by row and column indices being comparable to "input" and "output".
May
29
answered closed set in another closed set
May
25
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
Jan
6
comment Why do books titled “Abstract Algebra” mostly deal with groups/rings/fields?
You're missing a right parenthesis in the first paragraph.
Dec
29
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.
Dec
29
comment Do complex numbers really exist?
Harry's comment actually seems like a decent answer, although obviously you couldn't explain it in terms of fields to someone in high school. The complex numbers are a way of defining a way of multiplying together pairs of real numbers.
Aug
7
awarded  Critic
Aug
7
awarded  Scholar
Aug
7
awarded  Supporter
Aug
7
comment Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is?
Thanks for the concise and correct answer!
Aug
7
accepted Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is?
Aug
7
asked Is the function $(x, a) \mapsto (F(x,a), a)$ continuous whenever $F$ is?