Reputation
11,247
Next privilege 15,000 Rep.
Protect questions
Badges
5 26 74
Impact
~257k people reached

1d
revised What is known about these arithmetical functions?
deleted 2 characters in body
2d
comment How to solve $(z^1+z^2+z^3+z^4)^3$ using Pascals Triangle?
See Multinomial theorem and/or Pascal's simplex...
2d
revised What is known about these arithmetical functions?
added 110 characters in body
2d
revised What is known about these arithmetical functions?
gernalized to N
Jun
29
comment What is known about these arithmetical functions?
@Batominovski in fact I completely changed it. Maybe parts of our discussion doesn't make sense to some reader. Sorry for that...
Jun
29
comment What is known about these arithmetical functions?
I was looking for something a little more, let's say, elaborated. See my edit...
Jun
29
revised What is known about these arithmetical functions?
added 374 characters in body; edited tags; edited title
Jun
29
revised What is known about these arithmetical functions?
added 374 characters in body; edited tags; edited title
Jun
29
comment Tensor product of 2 vectors
I don't think so: an easy example with two 2-dimensional vector should illumate this: $(a_1,0)\otimes (0,b_2)=(0,a_1\cdot b_2,0,0)\neq \vec 0$...
Jun
29
comment Tensor product of 2 vectors
Why not? If you say $b_j=0$ to me this means $\vec b = 0$, since you didn't specify $j$ I apply it to any $j$...
Jun
29
comment Determining complexity of a 3D shape
Why is the scissor at medium level of complexity?
Jun
29
comment Counting square free numbers co-prime to $m$
aha...Why? ${ }$
Jun
29
comment Counting square free numbers co-prime to $m$
implemented at W|A...is it this what you wanna count?
Jun
29
comment Determine the number of graphs with v vertices
Isn't ${v \choose 2} = \frac{v(v-1)}2$...?
Jun
29
comment Determine the number of graphs with v vertices
Simple undirected graphs without multiedges?
Jun
24
revised How do I prove that the inverse of the matrix, M, below has all elements greater than or equal to 0?
edited body
Jun
24
comment What is the type of differential equation?
WolframAlpha says it is a "first-order nonlinear ordinary differential equation"...
Jun
24
comment Spectral Measures: Embedding
What is $P$...?
Jun
24
comment Determining complexity of a 3D shape
The "Quadratic type 1 surface" shown here looks connected to your example...BTW: when you put an extra "m" at the end of your image-link, e.g. i.stack.imgur.com/Is0gim.jpg they appear smaller. "s" makes them smallest...
Jun
24
comment Determining complexity of a 3D shape
Do you know about fractal dimensions?