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Maximus VonRueden

Feb 20, 2025

what does the curved E mean in maths?

its a weird shaped E
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4 Answers

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Jadon Smith

Feb 20, 2025

∈ 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.... Show More
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J
Jadon Smith

Feb 20, 2025

It's a Greek symbol called an 'epsilon'. It means "is an element of".... Show More
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J
Jadon Smith

Feb 20, 2025

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. .............. Show More
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J
Jadon Smith

Feb 20, 2025

It's a sigma Σ, and it means "sum of" or "summation"... Show More
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