![]() ![]() ![]() In TeX, \epsilon ( ϵ) denotes the lunate form, while \varepsilon ( ε) denotes the inverted-3 form. In Unicode, the character U+03F5 "Greek lunate epsilon symbol" ( ϵ) is provided specifically for the lunate form. (alpha) represents: the first angle in a triangle, opposite the side A. Computer systems therefore offer distinct encodings for them. Greek letters used in mathematics, science, and 1. While in normal typography these are just alternative font variants, they may have different meanings as mathematical symbols. The other, also known as lunate or uncial epsilon and inherited from earlier uncial writing, looks like a semicircle crossed by a horizontal bar. For NaCl(s), the lattice energy is defined as the enthalpy of the reaction NaCl(s) Na + (g) + Cl (g) wit h H called the lattice energy ( HLat ). One, the most common in modern typography and inherited from medieval minuscule, looks like a reversed "3". An important enthalpy change is the Lattice Energy, which is the energy required to take one mole of a crystalline solid to ions in the gas phase. The lowercase version has two typographical variants, both inherited from medieval Greek handwriting. Unicode (now) calls the curly epsilon "GREEK SMALL LETTER EPSILON" ( ε) (this is a textual Greek letter rather than a math alphabetic symbol) and the symbol that TeX traditionally assigns to \epsilon is called GREEK LUNATE EPSILON SYMBOL ( ϵ) the "symbol" being a hint that this is intended as a mathematical character rather than a textual Greek letter. The situation in TeX is no different really, different communities used different forms of epsilon and it is rather arbitrary which one gets which name. This is of course quite confusing and very close to being invalid as a notation. 1 Pearson skewness Equation (2.1.4) Beta sub 2 b 2 Pearson kurtosis Equation (2.1.4) Beta sub w b w Weighted beta or Equation (5.2.10) downside beta Delta squared d2 Variance of the jump Section 1.4 Delta d Excess return for Equation (1.5.2) anomaly Delta D Difference operator Section 1.4 DS t S t-S t-1 Delta D Change in price of an Section 3. In math and science, it may be used to denote an arbitrarily small quantity, like an error, or a value that can be taken as zero in some limit. The sign represents a variable, like the symbols x, n, and T. It is necessary to remark that there are communities that use both, but for different things (like my community /blushes). Epsilon is the fifth letter in the Greek alphabetic system, which is preceded by delta and followed by zeta letters. I added a special section about epsilon to the XML/HTML entities spec In TeX, \epsilon ( ) denotes the lunate form, while \varepsilon ( ) denotes the inverted-3 form. Historically there has been a lot of confusion over the two forms, (the situation with \phi and \varphi is similar but even more confused as at one point Unicode swapped the reference glyphs). ![]()
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