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Mar
5
answered Mean of i.i.d Random Variables With No Expected Value
Mar
4
reviewed Leave Closed Euler class and self-intersection number of a surface in a 4-manifold
Mar
4
reviewed Leave Closed Given an even function how to obtain the most close odd function and vise versa?
Mar
2
reviewed No Action Needed Evaluation of an $n$-dimensional integral
Mar
2
comment Is every graph the center of some other graph?
@RickyDemer: You're absolutely right! Nice observation.
Mar
2
awarded  Mortarboard
Mar
2
awarded  Enlightened
Mar
2
awarded  Nice Answer
Mar
2
answered Asymptotic behavior of $\{\text{#}(a,x,b,y)\in \mathbb{N^4}| \text{ }ax+by=n\}$ for large $n$
Mar
2
answered Is every graph the center of some other graph?
Mar
2
comment Is every graph the center of some other graph?
@QiaochuYuan: Great; thanks for checking!
Mar
2
comment Is every graph the center of some other graph?
@QiaochuYuan: I thought it would take one more step to connect $A$ to the end of $B$, and so $A$ would not be in the center; and the same for $B$. Am I missing something?
Mar
2
comment Is every graph the center of some other graph?
How about the following construction: Introduce two new vertices $A$ and $B$. Connect all the vertices in $C$ to $A$; and connect all the vertices in $C$ to $B$. From $A$ draw a long line with many vertices on it (the line doesn't have any other edges to $C$), and similarly from $B$ draw a long line with many vertices on it (same number of vertices as the line from $A$). Now if I understand your question correctly, I think $C$ is the center of this new graph.
Feb
28
reviewed Reject New arXiv procedures?
Feb
28
reviewed Close Invariants of an L-function
Feb
27
reviewed Approve Does Godel's incompleteness theorem admit a converse?
Feb
27
reviewed Approve Question about Nyman-Beurling-Baez-Duarte Equivalent for Riemann Hypothesis
Feb
27
answered Objections to and arguments for the simplicity of all Riemann zeros
Feb
26
reviewed Leave Closed Methods of probability theory in differential geometry fruitful?
Feb
26
reviewed Leave Closed Replacing the Lie commutator with something else