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Jun
10
comment $e^{X_t - \frac{t^3}{6}}$ is a martingale - show it
what is the SDE for $X_t$?
Jun
10
comment Using Union to prove a context-free language?
@sci1991 yes, that is the usual way
Jun
10
answered Using Union to prove a context-free language?
Jun
10
comment Stable matching solutions
please clarify your question
Jun
10
comment Using Union to prove a context-free language?
I agree that $L_1 \cup L_2 = L_2$, which happens because $L_1 \subset L_2$. Both are CFL -- but what new information does this give you? What are you trying to conclude that you don't know before your union argument?
Jun
10
comment Finding the number of primes numbers using exclusion/inclusion principle: What am I doing wrong?
can you elaborate on the basis of what you are using incl/excl? # of divisors?
Jun
10
comment Finding the number of primes numbers using exclusion/inclusion principle: What am I doing wrong?
are you possibly counting 1 in one place and not the other?
Jun
10
comment A difficult integral about function $\ln x$ and $\ln\ln x$
perhaps decompose $ln(1+x)$ into McLaurin series and integrate within radius of convergence?
Jun
9
revised Proof check: if for any two vertices the degree sum is $n-1$ then $G$ is connected
edited title
Jun
9
comment When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
@GEdgar fixed it thanks
Jun
9
revised When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
deleted 90 characters in body
Jun
9
answered When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
Jun
9
revised When does $(x^x)^x=x^{(x^x)}$ in Real numbers?
added 2 characters in body
Jun
9
comment Regarding Max flow problem ( Ford-Fulkerson Algorithm)
@Abellan you need another iteration I think, or the other ones come in the wrong order...
Jun
8
answered Regarding Max flow problem ( Ford-Fulkerson Algorithm)
Jun
8
comment Finding an approximate solution to a differential equation using finite difference method.
@Aljabra because $u(1,y) = 0$
Jun
8
answered Finding an approximate solution to a differential equation using finite difference method.
Jun
8
answered Probability of a letter being in a four letter word.
Jun
8
comment How can I solve $\int \sqrt{x}^\sqrt{x}dx$
My hunch would be to write $$ \sqrt{x}^\sqrt{x} = \frac{\sqrt{x}^{1+\sqrt{x}}}{\sqrt{x}} $$ and change variables to $u = \sqrt{x}$ with $du = dx/(2\sqrt{x})$, may be simpler. You end up with something like $\int u^{u+1} du$...
Jun
8
revised How can I solve $\int \sqrt{x}^\sqrt{x}dx$
deleted 15 characters in body; edited title