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A rounded epsilon meaning membership of a set.
Also known as: Set membership sign, Belongs to sign
The element-of sign states that something is a member of a set. It is drawn very like the Greek letter epsilon and is routinely mistaken for it, though one asserts a relation and the other names a quantity.
States that the item on its left is a member of the set on its right.
Contexts: Mathematics
Is struck through to state the opposite — that something is not a member of the set.
Contexts: Mathematics
Was introduced by Giuseppe Peano, who based it on the first letter of the Greek word for is.
From 1889 · Contexts: Mathematics
A rounded shape open to the right with a horizontal bar across its middle, like a squared-off letter e.
Drawn almost identically to the Greek letter epsilon. This sign asserts a relation; the letter names a quantity.