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Jul
1
answered An injection from R × {0, 1} to R
Jun
29
answered Suppose that $\alpha$ root of the equation
Jun
28
revised Problems on Pythagorean triangle
deleted 19 characters in body
Jun
28
answered Problems on Pythagorean triangle
Jun
26
answered I am looking for a function in order to measure points misalignment
Jun
25
answered Prove that $\sin{\frac{2\pi x}{x^2+x+1}}=\frac{1}{2}$ has no rational roots.
Jun
24
answered Why do calculus students learn to think of the derivative as a limit?
Jun
16
comment How to find $\lim _{ n\to \infty } \frac { ({ n!) }^{ 1/n } }{ n } $?
@draks... Thank you fixed, forgot to write the ln.
Jun
16
revised How to find $\lim _{ n\to \infty } \frac { ({ n!) }^{ 1/n } }{ n } $?
added 4 characters in body
Jun
16
answered How to find $\lim _{ n\to \infty } \frac { ({ n!) }^{ 1/n } }{ n } $?
Jun
12
comment Find if three points in 3-dimensional space are collinear
@tmsimont $\Rightarrow$ is easy: the point in the middle breaks the long segment into two small pieces.... $\Leftarrow$ Assume by contradiction they are not colinear, then they form a triangle and the condition contradicts the triangle inequality....
Jun
11
comment How to prove using Plane Geometry that Centroid divides in ratio $2$:$1$
Can the downvoter explain what is wrong with this solution?
Jun
11
answered How to prove using Plane Geometry that Centroid divides in ratio $2$:$1$
Jun
11
comment Find pmf for $i=0,1,2,3,4$
Note that by your computation, the sum of your probabilities is not 1.....
Jun
10
answered Characterizing an anlytical function by its value on the real line
Jun
8
comment Does $kp +1$ form of divisors of :$ p^n+1 $ , for $n =2k >2$ and $1<kp +1<p^n+1$?
What do you mean? Do you want to know if all divisors have this form or if it is possible for one divisor to have this form?
Jun
7
answered Is the Laplacian matrix of a directed graph positive semi-definite?
Jun
7
comment Is the Laplacian matrix of a directed graph positive semi-definite?
It becomes positive definite if for $D$ you use the sum of in and out degrees.
Jun
7
comment How is it true that zero is neither a positive number nor a negative number?
If zero would be positive then $(-1) \cdot 0$ would be negative...
Jun
7
answered If $(I-A)(I+A)^{-1}$ is orthogonal then prove that A is skew symmetric.