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Jan
12
comment How to find a planar graph if I know that it has 7 faces with certain sizes?
sorry, that was not a very good question.
Jan
12
comment How to find a planar graph if I know that it has 7 faces with certain sizes?
Can we have vertices of degree $2$?
Jan
12
comment How to find a planar graph if I know that it has 7 faces with certain sizes?
Hint: draw stuff
Jan
12
comment Permutations of variable size using the letters of a word
Oh, I do not count the "empty word" as a word by the way.
Jan
12
answered Permutations of variable size using the letters of a word
Jan
12
comment Permutations of variable size using the letters of a word
Yeah, I hadn't read that you wanted variable lengths at first. that makes it more interesting. Of course we can just iterate over all possible combinations of multiplicity for each letter and use multinomial coefficients
Jan
12
comment Permutations of variable size using the letters of a word
If I had a nickel for every time this question has been asked !!
Jan
12
answered Nested absolute-value inequality
Jan
12
comment Number of ways of selling 5 products for 4 customers
Did you try 30% OFF ?
Jan
10
comment Points of a root in a rooted, connected graph
what is $C_k$ and $G_{p-k}$?
Jan
9
answered To prove there is only a finite number of subgroups in G
Jan
8
comment Does lim$_{a \rightarrow b } \space d(a,b) = 0 $ imply completeness in a metric space?
oh ok, thank you very much for your help!
Jan
8
comment Does lim$_{a \rightarrow b } \space d(a,b) = 0 $ imply completeness in a metric space?
So to make the story short, the question makes no sense right? It is equivalent to asking: is every metric space complete?
Jan
8
comment Does lim$_{a \rightarrow b } \space d(a,b) = 0 $ imply completeness in a metric space?
Oh good to know, I was confused by OP.
Jan
8
answered Prove: $\forall$ $n\in \mathbb N, (2^n)!$ is divisible by $2^{(2^n)-1}$ and is not divisible by $2^{2^n}$
Jan
8
answered How can this function possibly ever be greater than another?
Jan
7
comment Group of order 63
it is a group of order $p^2q$
Jan
7
answered Number of binary operations on a set
Jan
6
comment Find what row a given number exists in within a binary heap tree.
Sure, I added a c++ function that finds the floor, just be careful your number is an int under 2^62
Jan
6
revised Find what row a given number exists in within a binary heap tree.
added 149 characters in body