Concept
How is cardinality written using mathematical notation?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"The notation we use for cardinality is vertical bars, like with absolute value. So we write: | M | = 3. To restate the example immediately above, | ∅ | = 0, but |{ ∅ }| ="
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