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correct equality statement

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Justice Almanzar
2020-08-24 16:45:36 -04:00
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@@ -82,7 +82,7 @@ D = { 2x : x ∈ N } = { 0, 2, 4, 6, 8, ... }
* If two sets contain the same items then we say the sets are equal, e.g. `A = B`. * If two sets contain the same items then we say the sets are equal, e.g. `A = B`.
* Order does not matter when determining set equality, e.g. `{ 1, 2, 3, 4 } = { 2, 3, 1, 4 }`. * Order does not matter when determining set equality, e.g. `{ 1, 2, 3, 4 } = { 2, 3, 1, 4 }`.
* Sets are disjoint, meaning elements cannot be repeated, e.g. `{ 1, 2, 2, 3, 4, 3, 4, 2 } = { 1, 2, 3, 4 }`. * Sets are disjoint, meaning elements cannot be repeated, e.g. `{ 1, 2, 2, 3, 4, 3, 4, 2 } = { 1, 2, 3, 4 }`.
* Two sets `A` and `B` are equal if and only if `A ⊂ B` and `B ⊂ A`. * Two sets `A` and `B` are equal if and only if `A ⊆ B` and `B ⊆ A`.
## Special Sets ## Special Sets