13,828 reputation
33078
bio website sites.google.com/site/rknmodn
location Halifax, Canada
age 32
visits member for 4 years, 1 month
seen Feb 26 at 5:52

This account is no longer in use.


Aug
28
revised mean of two consecutive number helps proving both number equals..
edited tags
Aug
28
revised How do I explain the fallacy $\frac00=2$ in this case?
edited tags
Aug
28
revised Critique on a proof by induction that $\sum_{i=1}^n i^2= n(n+1)(2n+1)/6$?
re-titled; re-tagged
Aug
28
revised Simultaneous solution(s) to $a^2+4b^2+4ab=0$ and $a^2+4b^2+32+16a-8b=0$?
re-titled; re-tagged
Aug
28
comment Have you seen this formula for factorial?
This works then: $n!=\prod_{p^a \leq n} p^{\lfloor n/p^a \rfloor}$ where the sum is over all primes $p$ and $a \geq 1$ such that $p^a \leq n$.
Aug
28
comment Have you seen this formula for factorial?
I'm wondering if it can be fixed by using something like "prime power p" or something similar. It's still not right, but a correction term perhaps could be introduced.
Aug
28
comment Have you seen this formula for factorial?
Wrong, as in it's not right. E.g., $4!=24$ and $\prod_{p \leq 4} p^{\lfloor 4/p \rfloor}=2^2 \times 3=12$.
Aug
28
comment Have you seen this formula for factorial?
The first formula is wrong for $n \geq 4$.
Aug
27
revised Area of a region between curves and a point.
edited tags
Aug
27
revised Find an algorithm to compute $(1! \cdot 2! \cdot3!\cdots n! ) \,\%\, x$.
edited tags
Aug
26
reviewed No Action Needed difference between $f(x)=0$ and $y=f(x)$.
Aug
26
reviewed Leave Open difference between $f(x)=0$ and $y=f(x)$.
Aug
26
comment Randomly partitioning a set
I think the question is: Choose $x$ subsets $M_1,M_2,\ldots,M_x \subseteq L$, each uniformly at random from all $\binom{|L|}{|L|/2}$ subsets of size $|L|/2$. What is the probability that $\cup_{i=1}^x M_i \neq L$? (Hopefully we have $|L| \equiv 0 \pmod 2$.)
Aug
26
comment Troubles solving a graph problem
Ah you're right; they are labelled digraphs.
Aug
26
comment Troubles solving a graph problem
If bidirectional edges are disallowed, then it's unique (in this case cycles must have length $\geq 3$).
Aug
26
reviewed No Action Needed Troubles solving a graph problem
Aug
26
answered How to quit GAP script?
Aug
26
comment How to quit GAP script?
I usually write the scripts in a text file and Read(...) them into GAP. Is a possible alternative for you? I didn't realise this feature was even present.
Aug
25
revised Determine all possible automorphisms of a graph
Added drawing; other minor touch-ups.
Aug
24
comment Knights on Multidimensional Torus Chessboard
How does a knight move in $k$ dimensions?