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cap
The symbol
used to denote the intersection between
two sets. Thus the intersection between sets
P and Q is written as P
Q. This is illustrated in a Venn diagram
as the region of overlap between two sets. The cap was first used as the symbol for intersection by Guiseppe Peano in Calcolo Geometrico secondo l'Ausdehnungslehre di H. Grassmann (1888). See also union.
Related categories
• SETS AND SET THEORY• SYMBOLS AND NOTATION
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