Abstract
In the first section we explain how one can find generalized gradients for distance functions in situations where the function might not be smooth. This critical point technique is used in the proofs of all the big theorems in this chapter.
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Petersen, P. (2016). Sectional Curvature Comparison II. In: Riemannian Geometry. Graduate Texts in Mathematics, vol 171 . Springer, Cham. https://doi.org/10.1007/978-3-319-26654-1_12
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DOI: https://doi.org/10.1007/978-3-319-26654-1_12
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