219 reputation
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location Houston, TX
age 32
visits member for 3 years, 6 months
seen Jul 8 at 0:58

Jun
1
comment How many possible game boards(game states) of tic tac toe n x n is possible?
@Yoda: May it be assumed that the first player uses X?
Jun
1
comment How many possible game boards(game states) of tic tac toe n x n is possible?
@benh: No, this includes games in progress, the other only includes completed games. Also, the OEIS sequence appear to distinguish between different paths, this question only considers the state.
Jun
1
comment Why do we drop the abolute value bars when doing indefinite integration?
@alexqwx: Both. You've chosen $$A_1 = e^C$$ and they have chosen $$A_2 = \pm e^C$$. Either one is valid.
Jun
1
comment Why do we drop the abolute value bars when doing indefinite integration?
No, putting sin in the exponent is not "fixed". You still are making $$|y| = A \sin x$$, but it is not
May
23
comment In a school 80% students passed in math and 65% passed in physics
Just draw a Venn diagram.
May
6
comment calculate the angles of a triangle?
Shouldn't this be tagged trigonometry and not calculus?
Apr
25
comment Solving limit without L'Hôpital
Choosing the negative root is equally valid, and soon simplifies to the same result.
Apr
25
comment Does 17% have to be equal to 0.17?
Many of these comments are confusing $17\% x \not\equiv 0.17$ (correct) with $17\% x \neq 0.17$ (conditionally true)
Apr
3
comment Can a coin with an unknown bias be treated as fair?
@ShreevatsaR: At least on other SE network sites it's accepted to use the answer area for comments which are either long, formatted, or contain images. Provided, of course, that one begins by "I would have made this a comment but couldn't because _____"
Mar
20
comment Are continuous functions monotonic for very small ranges?
@IttayWeiss: Any given trajectory is $B(t) : \mathbb{R} \rightarrow \mathbb{R}$. The domain is time, which is a real number, and the result is position, also a real number.
Mar
20
comment Are continuous functions monotonic for very small ranges?
@IttayWeiss: It's a function of time. Or a probability space which is a function of time.
Mar
13
awarded  Yearling
Mar
13
answered A beautiful identity of $\sin(x)$
Mar
13
comment A beautiful identity of $\sin(x)$
Some major typos in your proof... the term (sin(x)cos(y)−sin(x)cos(y)) is just zero. Second to last line has mismatched parentheses. I presume you did this right on paper and made a mistake typing it in?
Feb
15
comment Is this trig step correct?
It is not true that $\sin^{-1}(\sin(x)) = x \quad \forall x$.
Feb
15
comment Is this trig step correct?
It is not true that $\sin^{-1}(\sin(x)) = x \quad \forall x$. arcsin is odd, and so the manipulation the question asks about is correct, but it is not a true inverse of sin, because the sine function is not invertible.
Feb
10
comment Using “we have” in maths papers
"Given a point P∈X, the residue map resP:ΩK(X)→k is defined by ...." or "Given a point P∈X, XYZ defines the residue map resP:ΩK(X)→k"
Feb
3
awarded  Critic
Feb
3
comment Help proving ${n \choose k} \equiv 0 \pmod n$ for all $k$ such that $0<k<n$ iff $n$ is prime.
Take your statement that begins with "Furthermore" and replace "even" with "divisible by 2" and "is odd" with "is congruent to 1 (modulo 2)". Now, generalize by replacing 2 by k with k > 1. Since n is not prime, such a k exists.
Feb
3
revised Is it faster to count to the infinite going one by one or two by two?
put in the asterisk, using code escaping to avoid interpretation as italic