MathType - The indicator function of the rational numbers is also known as Dirichlet function. Dirichlet was the first to study this types of functions, which are nowhere continuous #Analysis #MathType | Facebook
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math mode - How do you get \mathbb{1} to work (characteristic function of a set)? - TeX - LaTeX Stack Exchange
Does anybody use LaTeX to take notes, especially during class? If not, what do you use, especially when you need to write down equations? - Quora
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