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1d
answered Why is this simplex procedure not working? $\min z = y - x + 1$
1d
awarded  Custodian
1d
reviewed No Action Needed Very difficult sum of series
1d
reviewed No Action Needed Volume of a solid in spherical coordinates
1d
reviewed No Action Needed How do I change $\cos(\frac{\theta}{2})$ into $\cos(\theta)$ in an equation?
1d
reviewed No Action Needed A plan to defeat a betting game where the odds of winning are 50/50. Help me understand why it's flawed.
Aug
26
comment What if objective function $Z$ is also in the constraints?
The constraint should instead be $\sum_j y_j = 1$ (there's also a constraint that $y\ge0$). Incidentally, this proves the Minimax Theorem for two-player zero-sum games.
Jun
2
comment If $y=x^{x^{x^{x^{x^{.^{.^{.}}}}}}}$ then how $y=x^y$?
I haven't proven that the tower converges. I proved that $(b_n)$ converges, since the OP asked me to in the comments.
Jun
1
awarded  Nice Answer
May
31
comment Variant on divergence theorem
@custodia Yes, in particular we can choose $\vec{k}$ to be each of the basis vectors.
May
31
comment Variant on divergence theorem
One way to show the identity is to apply the divergence theorem on $\vec{k}f$, where $\vec{k}$ is a constant vector, and noting that $\nabla\cdot\vec{k}f=\vec{k}\cdot \nabla f$, since $\vec{k}$ is constant.
May
31
revised If $y=x^{x^{x^{x^{x^{.^{.^{.}}}}}}}$ then how $y=x^y$?
added 426 characters in body
May
31
answered If $y=x^{x^{x^{x^{x^{.^{.^{.}}}}}}}$ then how $y=x^y$?
May
10
awarded  Yearling
Feb
11
reviewed No Action Needed MENSA IQ Test and rules of maths
Feb
10
reviewed No Action Needed Can anyone outline the steps for constructing general colimits?
Feb
10
reviewed Reviewed Continuum in an open interval
Oct
16
comment Is it true that $\lvert \sin z \rvert \leq 1$ for all $z\in \mathbb{C}$?
The second equation should read $4i=e^{iz}-e^{-iz}$. The error carries on from there.
Sep
21
accepted On the roots of $t^4-6\sqrt3t^3+8t^2+2\sqrt3t-1=0$
Sep
21
comment On the roots of $t^4-6\sqrt3t^3+8t^2+2\sqrt3t-1=0$
Excellent, thanks. For the last sentence, you mean $n=0,1,2,4$.