notation - Backwards epsilon - Mathematics Stack Exchange What does the $\\ni$ (backwards element of) symbol mean? It doesn't appear in the Wikipedia list of mathematical symbols, and a Google search for "backwards element of" or "backwards epsilon" turns
Good Explanation of Epsilon-Delta Definition of a Limit? I'm really doing my best but completely failing to understand the epsilon-delta definition of a limit I vaguely understand it like this: Given a bound on the difference between the input and desired