what does the curved E mean in maths?
What does the curved "E" symbol represent in mathematics? I've come across this symbol, which looks like a strangely shaped "E," and I'm curious to understand its meaning and use. Could someone explain?
4 Answers
∈ means "is an element of" or "belongs to". An example is 1 ∈ {1,2,3} because 1 is an element of the set {1,2,3,}. A more general example would be if R is the set of real numbers then x ∈ R means x is an element of the set of real numbers.
ε (epsilon) is a greek letter typically used in the definition of what a limit is from calculus.
Σ (sigma) is another greek letter used to show the sum. Say you have Σ from n=1 to 5 of n. Then you plug in 1 for n, then 2 for n, then 3 for n, and so on. Add all those up and you have 1 + 2 + 3 + 4 + 5 = 15.
If you mean Є, it is usually preceded by a number or term and represents the number or term as an element in a set.
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