Is there any maximal 1-planar or 2-planar graph that is not 3-connected

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Is the number of solutions of $\phi(x)=n!$ bounded? If yes, what is its bound?

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density of singular K3 surfaces

How many squares can be formed by using n points?

Which complete orthomodular lattices arise from von Neumann algebras?

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What is the appropriate notion of weakly equivalent or Morita equivalent categories internal to a category of generalized smooth spaces?

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