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Oct
21
comment What is the variance E[A]^2, statistics?
Where are you stuck? FYI, $E[A]$ is a constant, so that $E[A]^2$ is a constant, so that its variance is 0. Are you sure you wrote the question correctly?
Oct
12
answered Force of interest problem from Exam FM
Sep
30
awarded  Explainer
Sep
27
reviewed Reject suggested edit on Least sum of distances
Sep
25
comment M & M probability
@JimmyK4542 You're going to eat it when you get it. At least I am.
Aug
7
reviewed Approve suggested edit on Proof of trigonometric identity $\cot \theta \sec\theta= 1/ \sin\theta$
Aug
7
comment Who are some blind or otherwise disabled mathematicians who have made important contributions to mathematics?
Euler became blind later in life and his Wikipedia article suggests he may have sped up his productivity after that with the help of scribes.
Jul
2
awarded  Curious
Jun
7
reviewed Approve suggested edit on What properties does a graph G which does not have a triangle free euler circuit have?
May
22
answered Notation in Actuarial text
Apr
25
awarded  Notable Question
Apr
19
reviewed Approve suggested edit on How do I find the polynomial degree of f?
Apr
5
awarded  Good Answer
Mar
24
awarded  Yearling
Mar
23
reviewed Approve suggested edit on How to find perpendicular vector to another vector?
Mar
18
awarded  Popular Question
Jan
22
awarded  Nice Answer
Jan
12
comment Existence of an orthogonal matrix that converts $AB$ to $BA$
I don't see any question at all.
Jan
4
comment How should I denote “undefined” in a functions definition
This is a standard theorem in every calculus book. If you are taking the limit as $x \to a$ of two functions that are exactly the same except at one point $b$ (which could be $a$ or not $a$), and if the limit of one of the two functions exists and is $L$, then you automatically know that the limit of the other function exists and is also $L$.
Jan
4
answered How should I denote “undefined” in a functions definition