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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
What is epsilon algebra and why is it important in Numerical Analysis . . . The epsilon algebra is a simple method compared to the more advanced interval arithmetic which can be used to put bounds on rounding and measurement errors in computation The advantage of epsilon algebra is that simple rules of calculation are sufficient compared to the complicated calculation rules of interval arithmetic