Weird E letter? (sigma) - Mathematics Stack Exchange
This is a capital sigma. Its use is best illustrated by an example: ∑k=14 1 k = 1 1 + 1 2 + 1 3 + 1 4. ∑ k = 1 4 1 k = 1 1 + 1 2 + 1 3 + 1 4. You begin by replacing the index (in this case, k k) with the first value it takes on (in this case, 1). You then proceed to the next number and keep doing this replacement until you are at the upper ...
notation - What does "∈" mean? - Mathematics Stack Exchange
Jun 25, 2014 · Another possible notation for the same relation is {\displaystyle A\ni x,} A\ni x, meaning "A contains x", though it is used less often. The negation of set membership is denoted by the symbol "∉". Writing {\displaystyle x\notin A} x\notin A means that "x is not an element of A".
notation - What does the Greek "E"-like symbol mean?
Sep 28, 2017 · $\begingroup$ One could add that in typed math, the summation sign $\sum$ and the capital Sigma $\Sigma$ are rarely exactly the same. I'm not sure how widespread this is for handwriting though (I have different symbols, but some …
Where did these symbols come from? - Mathematics Stack Exchange
19. They are Greek letters. The first two you mentioned are Pi (π π) and Phi (ϕ ϕ), respectively (note the spelling). What you refer to as "weird E/sideways M" is the capital letter Sigma (Σ Σ), and the one that looks like a triangle is the capital letter Delta (Δ Δ). Here is a table of Greek letters and their approximate equivalents ...
linear algebra - What does the double-lined capital $\mathbb{E}
The $\Bbb{E}$ means either Euclidean space, the expected value of a random variable, or a field in a tower of fields. This is from wikipedia. In your context it seems most likely to be the expected value of a random variable.
notation - Backwards epsilon - Mathematics Stack Exchange
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). Peano introduced the backwards lower-case epsilon for "such that" in his 1889 "Principles of arithmetic, presented by a new method," according van Heijenoort's From Frege to Gödel ...
How do I learn all the weird symbols and notations?
Dec 1, 2014 · Tμν =∂μϕ∂νϕ −ημνL (2) (2) T μ ν = ∂ μ ϕ ∂ ν ϕ − η μ ν L. The first of these is an extremely well-known formula, and quite "attractive" - it makes use of nothing more complicated than a square root sign. On the other hand, the second equation (which I'll add is not necessarily larger as in having more symbols than ...
functions - What does a mini circle between f and h(x) mean ...
Dec 8, 2014 · This notation means that you take the output of h h and use it as the input of f f. When we are working with a specific x x value, we can suggestively write f(h(x)) f (h (x)) instead. (f ∘ h)(x) = f(h(x)) = f(2 + 3x) = 1 2 + 3x. (f ∘ h) (x) = f (h (x)) = f (2 + 3 x) = 1 2 + 3 x. (Note: I only used z z as the variable for f f to avoid ...
notation - What does the symbol described below mean? (looks …
Apr 22, 2014 · Sea also Wikipedia's list of math symbols. The notation dates back to Peano according to Jeff Miller's Earliest Uses of Symbols of Set Theory and Logic: Giuseppe Peano (1858-1932) used an epsilon for membership in Arithmetices prinicipia nova methodo exposita, Turin 1889 (page vi, x).
What does the letter epsilon signify in mathematics?
Hilbert's epsilon-calculus used the letter ε ε to denote a value satisfying a predicate. If ϕ(x) ϕ (x) is any property, then εx. ϕ(x) ε x. ϕ (x) is a term t t such that ϕ(t) ϕ (t) is true, if such t t exists. One can define the usual existential and universal quantifiers ∃ ∃ and ∀ ∀ in terms of the ε ε quantifier: