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https://arxiv.org/abs/0909.2822 [0909.2822] The Askey scheme as a four-manifold with corners Abstract page for arXiv paper 0909.2822: The Askey scheme as a four-manifold with corners askey scheme four manifold 0909 2822 https://www.mdpi.com/2075-1680/12/5/432 On an Indefinite Metric on a Four-Dimensional Riemannian Manifold Our research focuses on the tangent space of a point on a four-dimensional Riemannian manifold. Besides having a positive definite metric, the manifold is... four dimensional indefinite metric riemannian manifold https://arxiv.org/abs/1910.07372 [1910.07372] A survey of the foundations of four-manifold theory in the topological category Abstract page for arXiv paper 1910.07372: A survey of the foundations of four-manifold theory in the topological category