Koba
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### Questions (48)

 6 Derivative of the $f(x,y)=\min(x,y)$ 4 Proving that matrix $B=C$ 3 Is the “first nonzero digit” function surjective? 3 Find equation of a plane that passes through point and contains the intersection line of 2 other planes 3 Convergence of a series with factorials, ratio test

### Reputation (587)

 +5 Derivative of the $f(x,y)=\min(x,y)$ +10 Using the definition of a concave function prove that $f(x)=4-x^2$ is concave (do not use derivative). +5 Convergence of a series with factorials, ratio test +10 Probability: Find a value to make this equation hold true

 3 To determine whether the integral $\int_0^{\infty} \frac{\sin{(ax+b)}}{x^p} \,\mathrm dx$ converges for $p>0$ 3 Using the definition of a concave function prove that $f(x)=4-x^2$ is concave (do not use derivative). 2 Continuous second order partial derivates in open region R 1 Probability: Find a value to make this equation hold true 1 How to solve $\sinh x = x$?

### Tags (39)

 5 calculus × 8 3 improper-integrals 4 multivariable-calculus × 17 2 differential-equations × 6 4 economics × 9 1 derivatives × 3 4 convex-analysis × 6 1 probability × 2 3 integration × 2 1 analysis

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 Mathematics 587 rep 731 Stack Overflow 355 rep 316 German Language 191 rep 4 Salesforce 161 rep 8 Area 51 151 rep 2