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Apr
3
answered Prove by induction: For all N = 0, 1, 2, 3, ..: every finite set with N elements has exactly $ 2^N $ subsets.
Apr
3
answered Find the Laplace transform of $f(t) = \begin{cases} 0, & \text{if $t<5$} \\ t^2−10t+31, & \text{if $t\ge 5$} \\ \end{cases} $
Apr
3
revised Find the Laplace transform of $f(t) = \begin{cases} 0, & \text{if $t<5$} \\ t^2−10t+31, & \text{if $t\ge 5$} \\ \end{cases} $
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Apr
3
revised Can the matrix $A=\begin{bmatrix} 0 & 1\\ 3 & 3 \end{bmatrix}$ be diagonalized over $\mathbb{Z}_5$?
LaTeX edits
Apr
3
comment Proof By Counterexample, pigeonhole
@YoniRozenshein $M$ and $m$ are different, is that expected? Could be $n \in \mathbb{R}\backslash \mathbb{Z}$.
Mar
28
comment Differentiation of summation of summation
I mean $i=j$ -- then differentiation will have a different outcome since you are differentiating $a_{kk}x_k^2$.
Mar
28
revised Non-Deterministic Turing Machine Algorithm
LaTeX edits
Mar
28
comment Differentiation of summation of summation
What about when $j=k$?
Mar
28
comment How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?
I thought the whole point is that $\arccos$ is expensive. Is $\arcsin$ any cheaper?
Mar
28
awarded  Custodian
Mar
28
reviewed Approve suggested edit on Proof by induction: Show that $7|5^{2n}-2^{5n}$
Mar
28
revised Expected value of c.d.f when normal distributed
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Mar
25
comment Existence of Minimum Value
Welcome to Math stackExchange, I hope you like it. What did you do on this problem? BTW if it's a homework problem, please add the homework tag.
Mar
25
revised Probability using mean and SD
LaTeX edits
Mar
25
comment Probability distribution of a random components vector
Are you assuming $\rho_x, \rho_y, \rho_z$ are independent?
Mar
25
revised probabily on tetrahedron
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Mar
25
revised Formal Notation of Functions
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Mar
22
comment Probability of winning blackjack dice game?
If the only thing you need is one number (likelihood of winning) for this one case, may be writing a simulation is faster.
Mar
22
comment Calculate:$\int \frac{1}{(x+1)^\frac{3}{4}(x+2)^{\frac{5}{4}}}\ dx$
partial fractions?
Mar
22
revised Projectiles Question. A level
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