![]() ![]() Conventionally it’s used to denote a small quantity, like an error, or perhaps a term which will be taken to zero in some limit. The greek letter epsilon, written ϵ or ε, is just another variable, like x, n or T. ![]() Double-click on the one you want to insert. Type U+0259, a schwa will appear in the Character code area. How do I type that character? With the Unicode Hex Input keyboard selected (click the Input menu button in the menu bar and select “Unicode Hex Input” rather than “U.S.”), hold down the Option key on the keyboard and type the Unicode character code. It is possible to type an uppercase schwa by holding the ‘ALT’ key and typing ‘0399’ and a lowercase schwa by holding ‘ALT’ and typing ‘0601.
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