mcb

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291 reputation

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13 Questions

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6	Find a sum of appropriate values of $\cos$ and $\sin$ to determine the value of a series
4	How can I prove the inequality $\frac{1}{x} + \frac{1}{y} + \frac{1}{z} \geq \frac{9}{x+y+z}$?
3	Are there any trivial examples of languages that cannot be produced by formal grammars?
3	How can I prove that the binomial coefficient ${n \choose k}$ is monotonically nondecreasing for $n \ge k$?
3	I'm confused: does # mean Q.E.D. or contradiction?

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291 Reputation

+5	Why is the universal quantifier $\forall x \in A : P(x)$ defined as $\forall x (x \in A \implies P(x))$?
+15	Are there any trivial examples of languages that cannot be produced by formal grammars?
+10	Solutions to $z^3 - (b+6) z^2 + 8 b^2 z - 7+b^2 = 0, b\in \mathbb R, z \in \mathbb C$
+5	Find a sum of appropriate values of $\cos$ and $\sin$ to determine the value of a series

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0 algebra-precalculus × 3	0 complex-numbers
0 abstract-algebra × 2	0 definition
0 sequences-and-series × 2	0 formal-grammar
0 analysis	0 formal-languages
0 binomial-coefficients	0 geometry

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