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What does a sideways u mean in math?

Updated: 4/28/2022
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9y ago

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It is used in set theory and its meaning depends on the way that it is facing.

If the open end is to the right then it indicates that the first set is a subset of the second.

If the open end is to the left then it indicates that the first set is a superset of the second (the second is a subset of the first).

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9y ago
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Q: What does a sideways u mean in math?
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