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Aug
29
accepted Conflicting definition of eulerian graph and finite graph?
Aug
29
awarded  Famous Question
Aug
29
comment Conflicting definition of eulerian graph and finite graph?
Take this example, is it a finite graph? It has an even number of vertices with odd valency, but it also has an odd number of vertices with odd valency.
Aug
29
comment Conflicting definition of eulerian graph and finite graph?
Now I get it. It could - for example - have 15 vertices but only two of them having odd valency. Now I understand.
Aug
29
comment Conflicting definition of eulerian graph and finite graph?
@N.S. But if it has 3 vertices, can it still be called a finite graph?
Aug
29
comment Conflicting definition of eulerian graph and finite graph?
Even number of vertices with odd valency. Doesn't it mean that each vertex has odd valency?
Aug
29
asked Conflicting definition of eulerian graph and finite graph?
Aug
27
accepted Use $\sin^22t=4\sin^2t(1-\sin^2 t)$ to show that $\sin t$ is not a polynomial?
Aug
26
asked About the convenient rewriting of formulas of sequences?
Aug
26
asked Use $\sin^22t=4\sin^2t(1-\sin^2 t)$ to show that $\sin t$ is not a polynomial?
Aug
11
asked Where can I read about the techniques for computing areas and volumes before calculus?
Aug
10
asked Is the area of a convex polygon equal to the area of a circle with the same perimeter of the polygon?
Aug
3
awarded  Notable Question
Jul
21
comment Prove the reflexivity of $\subseteq$.
@GitGud Yes, but what you mean with "eliminating the universal quantifier"? Is there a process to do it or I just need to throw it away?
Jul
21
comment Prove the reflexivity of $\subseteq$.
@GitGud I don't really know. I've imagined some things but none of them is nice. I remember of the "getting hid of $\forall x$", I've heard a small piece about it in a lecture but I had to leave and didn't get the rest.
Jul
21
comment Prove the reflexivity of $\subseteq$.
@GitGud Excuse me. But what's the difference of $\forall$ and "take an arbitrary $x$"?
Jul
21
asked Prove the reflexivity of $\subseteq$.
Jul
20
revised Is there something that studies equivalent forms of writing and expression?
edited body
Jul
20
comment Is there something that studies equivalent forms of writing and expression?
@JHance Yes, thanks.
Jul
20
asked Is there something that studies equivalent forms of writing and expression?