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The letter Sigma. Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet.
Note: The empty set symbol ∅ looks similar, but is unrelated to the Greek letter. or represents: the golden ratio 1.618... in mathematics, art, and architecture; Euler's totient function in number theory; the argument of a complex number in mathematics; the value of a plane angle in physics and mathematics
Mathematical notation uses a symbol that compactly represents summation of many similar terms: the summation symbol, , an enlarged form of the upright capital Greek letter sigma. This is defined as = a i = a m + a m + 1 + a m + 2 + ... + a n - 1 + a n
In mathematics, by sigma function one can mean one of the following: The sum-of-divisors function σ a (n), an arithmetic function; Weierstrass sigma function, related to elliptic functions; Rado's sigma function, see busy beaver; See also sigmoid function
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...
This template displays the Greek letter sigma for use in mathematical equations. Template parameters [Edit template data] Parameter Description Type Status No italic noitalic Whether or not the character displayed is not italic. Unknown optional bold bold Whether to use the variation of the character that is bold. Note: Not every symbol has a corresponding bold character. Unknown optional See ...
The teen version of “mewing” is a “hush” symbol and touching the jawline to mean, “I can’t talk.” Lindsay tells TODAY.com that “sigma” is a classroom trend.
This template displays the Greek letter sigma for use in mathematical equations. Template parameters [Edit template data] Parameter Description Type Status Uppercase uc uppercase Whether or not the character displayed is uppercase. Unknown optional No italic noitalic Whether or not the character displayed is not italic. Unknown optional var var Whether to use the variation of the character for ...