How can we express the smallest ordinal $\alpha$ such that $X \subseteq \alpha$?

Does this poset have a unique minimal element?

Status of the 196 conjecture?

Internal categories in simplicial sets

Rigorous solution to Ricci Flow on dumbbell $S^3$

What is geometrically the Pontryagin class?

sequences with a fractal dimension

Understanding Specker's disproof of the axiom of choice in New Foundations

What is the status of Cantor-Schroder-Bernstein in Reverse Math?

Spectra of elements of a Banach algebra and the role played by the Hahn-Banach Theorem.

Classification of quasi-split unitary groups

Polynomial maps between noncommutative groups

If $X$ is a simplicial complex, is there a characterization of the links of its vertices that is equivalent to the statement "$|X|$ is a manifold"?

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