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visits member for 3 years, 7 months
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Jun
25
reviewed Close $E+F$ contains an interval
Jun
24
reviewed Looks OK Convergence in $L_1$ and Convergence of the Integrals
Jun
23
comment Any good books on Mathematics and Programming?
For the benefit of people from different educational systems, what does "still struggling with pre-calculus" mean? Can you solve a quadratic? How about simultaneous equations? What geometry are you comfortable with?
Jun
23
reviewed Close Zeros of a differentiable function are all of finite order and isolated?
Jun
22
reviewed Leave Open Maximal ideals in rings of polynomials
Jun
22
awarded  Custodian
Jun
21
comment Can a basis have dimension less than the space that spans?
The title is misleading (or indicates that you are misunderstanding the situation). S is a one-dimensional space, so the basis in fact has the same dimension.
Jun
21
reviewed No Action Needed What is the next number in the sequence: $24, 30, 33 , 39 , 51,…$
Jun
21
reviewed No Action Needed Is every element in a set also an element of the powerset?
Jun
21
reviewed Leave Open Terminology for a rectangle whose width/height ratio is between $r$ and $1/r$?
Jun
20
reviewed Looks OK Checking if a function is injective
Jun
20
reviewed No Action Needed Orthogonal transformation on random matrices
Jun
18
answered Directions in spherical coordinates
Jun
18
comment Directions in spherical coordinates
Do you also know the starting coordinates? If not, the answer is that you can't: in almost all cases, the best you can do is to narrow it down to two possibilities, and in some cases there are infinitely many possibilities.
Jun
17
reviewed Edit suggested edit on Why does this theorem fail for arbitrarily large n?
Jun
17
revised Why does this theorem fail for arbitrarily large n?
Extended suggested edit to include the bottom half of the second image
Jun
17
reviewed Reject suggested edit on isomorphism of $Q[x]/(x^2-3x + 2)$ and the ring, former by pairs $(a,b)$ with component addition and multiplication
Jun
17
comment Inverse of a polynomial function
What you effectively want to do is to solve the cubic $x^3 - 3x^2 + 4y = 0$ for values of $y \in [0\ldots 2]$. The tricky bit is that the range of $x$ specified is precisely that range for which there are three real roots, so you have to select the correct one.
Jun
17
reviewed Leave Open Jordan blocks and the characteristic polynomial.
Jun
17
answered multiplication in GF(256) (AES algorithm)