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 16h comment $G$ has exactly $n-1$ edges implies every edge of $G$ is a bridge direct proof by contradiction? 16h comment Combinatorics Problem - Counting. Oh yeah, good point he want $\binom{55}{7}$ minus that. 1d answered Combinatorics Problem - Counting. 1d answered Binary Operation in Group 1d comment Combinatorics Problem - Counting. This problem can be solved with the stars and bars method 1d comment Can a module have an infinite number of compositions series? Oh, apparently $\mathbb R^2$ does the trick, just take any subspace of dimension 1. 1d comment Can a module have an infinite number of compositions series? What is "dimension"? I meant it as length. 1d comment Can a module have an infinite number of compositions series? But $\mathbb Z$ doesn't have even a single composition series. 1d comment Can a module have an infinite number of compositions series? Well yeah, I can't think of an example of a finite dimensional module with an infinite number of submodules, a module with an infinite number of composition series would necessarily be such a module. What I need to find is the former, although I can't even find an example for the latter, which should be easier. 1d revised Can a module have an infinite number of compositions series? added 1 character in body 1d asked Can a module have an infinite number of compositions series? Nov 22 answered How to prove that a connected graph with $|V| -1= |E|$ is a tree? Nov 22 answered Graph theory notational issue? What does $|N(X)|$ mean? Nov 22 answered Prove that $b^5=1$ Nov 17 comment Lower bound on number of relatively prime pairs In terms of what? Nov 16 awarded Popular Question Nov 13 awarded Nice Question Nov 11 revised Why are triangles, squares and hexagons the only polygons with which it is possible to tile a plane? added 3 characters in body Nov 11 awarded Notable Question Nov 5 awarded probability