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2h
answered Let $A$ be a complex number and $B$ be a real number. Prove that $\mid z^2\mid+Re(Az)+B=0$ can only have a solution iff $\mid A^2 \mid \ge 4B$.
3h
answered How do we calculate the upper sum and lower sum of an Integral?
1d
comment Show that the equation $\cos(\sin x)=\sin(\cos x)$ has no real solutions.
@mavavilj: Mainly from $\sin u<u$ for all $u>0$.
1d
answered Show $\frac{\sin(x)}{x}>\cos(x)$ for $0<x<\pi$ using the Mean Value Theorem
1d
answered Solve $y''=y^2$
1d
revised Finding the maximum of a function on $ \Bbb{S}^{7} $.
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2d
answered Finding the maximum of a function on $ \Bbb{S}^{7} $.
2d
answered The number of times will an individual child goes to the cinema before a group is repeated.
2d
revised Why is the Lagrange Multipliers Theorem not working?
added 461 characters in body
2d
answered How do mathematicians find the underlying idea?
2d
answered Why is the Lagrange Multipliers Theorem not working?
2d
revised Let $A$ be an open set of $\mathbb{R}$ and $B$ any set, under what coniditions of $B$, $AB$ is open?
added 59 characters in body
2d
answered Let $A$ be an open set of $\mathbb{R}$ and $B$ any set, under what coniditions of $B$, $AB$ is open?
2d
answered Geometric interpretation of inverse complex function?
Aug
28
comment What is the probability that no two consecutive boxes have blue balls.?
The rules are not completely clear. In your counting all boxes had exactly one ball, but in answering a comment you admitted more than one ball in the same box. How many balls are "filled" into the five boxes in all?
Aug
28
revised define two functions whose compositions are equal to identity
added 317 characters in body
Aug
27
answered Definition of Random Variable on Measure Theory!
Aug
27
answered The complex structure of a complex torus
Aug
27
answered define two functions whose compositions are equal to identity
Aug
27
revised Is $\sin( | z^{2}| )$ ,where z is complex, analytic?
added 95 characters in body