Real Sequences and Their Limits
Part of the Undergraduate Texts in Mathematics book series (UTM)
The subset relation ⊆ between sets has the following properties:
If A is a set, then A ⊆ A.
If A and B are sets such that A ⊆ B and B ⊆ A, then A = B.
If A, B, and C are sets such that A ⊆ B and B ⊆ C, then A ⊆ C.
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© Springer-Verlag New York, Inc. 1983