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 Sep 30 awarded Explainer May 18 awarded Teacher Apr 18 accepted Showing existence of a spanning tree in a graph with two kinds of edges using $k$ of one kind of edge Apr 18 awarded Critic Apr 18 answered Does having an orthonormal basis imply that the vectors in that basis must all be orthongonal? Apr 18 awarded Organizer Apr 18 revised Random Variables Adding homework tag Apr 18 suggested approved edit on Random Variables Apr 18 suggested rejected edit on Find a basis for $\mathbf{W}^{\perp}$ given spanning vectors of $\mathbf{W}$ Apr 18 revised Does having an orthonormal basis imply that the vectors in that basis must all be orthongonal? Formatting Apr 18 suggested approved edit on Does having an orthonormal basis imply that the vectors in that basis must all be orthongonal? Apr 17 revised Generating function with dependencies Clarifying question Apr 17 awarded Citizen Patrol Apr 17 asked Generating function with dependencies Apr 17 comment Showing existence of a spanning tree in a graph with two kinds of edges using $k$ of one kind of edge I think you need a slight tweak here. If you order your edges such that when you add your first edge, it creates a cycle of all blue edges, you end up with an $A'$ that still has $\ell$ blue edges. However, I believe that you can always choose your edge to add such that it does not create an all blue cycle (assuming $\ell\neq m$), because if you can't, then you already have a spanning tree with the maximum number of blue edges, namely $m$ of them. Convoluted, but I think this covers it. Apr 17 awarded Editor Apr 17 revised Inserting if else in a mathematical expression is it possible LaTeX-ified Apr 17 suggested approved edit on Inserting if else in a mathematical expression is it possible Apr 17 revised Inserting if else in a mathematical expression is it possible LaTeX-ified Apr 17 suggested approved edit on Inserting if else in a mathematical expression is it possible