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analysis - What does $\epsilon$ mean in this formula - Mathematics . . . The symbol is called "epsilon," and is simply a variable, just like x x or y y However, note that ϵ ϵ is most commonly used in analysis as an arbitrarily small (but positive) value If you are new to the idea of an ϵ ϵ -neighborhood, check out this post Be sure not to confuse " ϵ ϵ " with " ∈ ∈ ", which means "element of " These symbols both looks like "e"s, but have much different
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