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Jul
24
answered How do I evaluate this combinatorically?
Jul
24
revised How do I evaluate this combinatorically?
added 92 characters in body
Jul
23
revised I dont see how this algebraic manipulation is valid (trig functions)
added 5 characters in body
Jul
23
comment Dividing the square
In what sense are you dividing into 4 equal parts - by area, or by perimeter? What does removing one edge of the square change?
Jul
23
revised Dividing the square
labels, content cleanup
Jul
23
answered Diagonalize a symmetric matrix
Jul
23
comment How do I solve a under-determined quadratic multi-variate system?
How many data points do you have available? I also don't understand how knowing the distributions of the $X_i$ will help for anything...
Jul
23
comment How do I solve a under-determined quadratic multi-variate system?
I don't understand the question. Do you have the data points $(y,x_1,x_2,x_3)$ and are asking which $\beta_{\cdot}$ were used to make them work?
Jul
21
comment How to solve $z^3 + \overline z = 0$
@robjohn indeed, but not much harder and i wanted the OP to do at least something by himself
Jul
21
answered Proving whether linearly independent
Jul
21
comment Proving whether linearly independent
@Mattos he meant $\ne$, like in programming
Jul
21
revised Proving whether linearly independent
added 1 character in body
Jul
21
answered What is X if position value is between 0 and 500 and I need it has -1 to 1?
Jul
21
comment Given that $p$ is an odd prime, is the GCD of any two numbers of the form $2^p + 1$ always equal to $3$?
I don't quite get it -- if $p=2$, you get $2^p-1=5$ and if $p=3$ then $2^p+1=9$, but $gcd(5,9) \not =3$
Jul
21
revised Evaluating a cube root
added 12 characters in body
Jul
21
answered To find a extremal point of a function with parameters
Jul
21
revised To find a extremal point of a function with parameters
typo
Jul
21
revised To find a extremal point of a function with parameters
edited body
Jul
21
answered How to solve $z^3 + \overline z = 0$
Jul
21
comment Pagerank existence of a graph given a vector
@NikhilShinday new question did not come through. consider posting it as a separate question and pasting the link here