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Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange The symbol ≅ is used for isomorphism of objects of a category, and in particular for isomorphism of categories (which are objects of CAT) The symbol ≃ is used for equivalence of categories At least, this is the convention used in this book and by most category theorists, although it is far from universal in mathematics at large
What is mathematical basis for the percent symbol (%)? Percent means 1 part of 100 or 1 100 and is indicated with % Per mille means 1 part of 1000 or 1 1000 and is indicated with ‰, so it seems that these symbols indicate the mathematical operations
Notation for rounding in equation - Mathematics Stack Exchange I'm wondering if there is a symbol or notation for Round to the nearest 10th For example, the area of a circle with a radius of 45 feet, rounded to the nearest square foot, could be written as, A =
Derivative of Christoffel symbol - Mathematics Stack Exchange It is impossible to derive the derivative of Christoffel symbol only in terms of metric and Christoffel symbols themself If it was possible, the stationary surface, determined by the Einstain equation for vacuum, could be parametrised by only metric tensor and Christoffel symbols