subset calculator
| set a (proper subset) | = |
| set b | = |
| set b is | = of set a |
subset definition: generally speaking, for two sets a and b, if any element in set a is an element in set b, we say that these two
there is an inclusion relationship between sets, and set a is called a subset of set b.
written as: a⊆b (or b⊇a)
read: "a contains b" ("b contains a")
- A ∪ B = B ∪ A.
- A ∪ (B ∪ C) = (A ∪ B) ∪ C.
- A ⊆ (A ∪ B).
- A ∪ A = A.
- A ∪ ∅ = A.
- A ⊆ B if and only if A ∪ B = B.