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希腊字母epsilon的两种写法ϵ，ε，一般认为哪个是原型，哪个是变体？ - 知乎 注意到\epsilon的Unicode全名是「Greek Small Letter Epsilon」，即「小写希腊字母Epsilon」；而\varepsilon的Unicode全名则是「Greek Lunate Epsilon Symbol」，即「半月形希腊标志Epsilon」，并没有提到「字母」。
notation - What does the letter epsilon signify in mathematics . . . $\begingroup$ Historically, the symbol $\in$ is derived from $\epsilon$, thus it is not impossible to confuse both symbols Also, not as ubiquitous as its primary usage, this Greek symbol $\epsilon$ or $\varepsilon$ is also used to denote the sign, including Levi-Civita symbol in physics and random sign in probability to name a few $\endgroup$
analysis - What does $\epsilon$ mean in this formula - Mathematics . . . $\begingroup$ As an aside, the $\in$ takes its basic shape from the Greek letter $\epsilon$ The symbol $\in$ means "is an element of", so using the Greek letter that starts the word "element" as a design inspiration isn't entirely unreasonable $\endgroup$
Proving limits with epsilon delta for Multivariable Functions Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
How do you prove that differentiability implies continuity with Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
notation - How to denote a very small number $\epsilon$ - Mathematics . . . When adding a "small" positive number $\epsilon$ to some quantity, one should might have some criterion in mind that $\epsilon$ should be "small enough" so that some properties are satisfied If one really wants to be precise, than one might want to state explicitly those properties out
notation - Backwards epsilon - Mathematics Stack Exchange The backwards epsilon notation for "such that" was introduced by Peano in 1898, e g from Jeff Miller's Earliest Uses of Various Mathematical Symbols: Such that According to Julio González Cabillón, Peano introduced the backwards lower-case epsilon for "such that" in "Formulaire de Mathematiques vol II, #2" (p iv, 1898)
Good Explanation of Epsilon-Delta Definition of a Limit? In the game our opponents value of epsilon and our responding value of delta must always be strictly greater than zero Saying "$\epsilon = 0$" or "$\delta = 0$" isn't an allowed move in the game; Our opponents aren't going to win by throwing larger values of $\epsilon$ at us because we can just repeat our previous $\delta$ and win that round