Each symbol or expression is listed with a short definition and the page number where it first occurs. The list is ordered by page number.

d | n |
d divides n with no remainder 6 |

x ∈ S |
x is an element of S 19 |

x ∉ S |
x is not an element of S 19 |

… | ellipsis 19 |

∅ |
the empty set 19 |

N |
natural numbers 20 |

Z |
integers 20 |

Q |
rational numbers 21 |

R |
real numbers 21 |

{x | P} |
set of all x satisfying propert P 21 |

A ⊆ B |
A is a subset of B 21 |

A ⊂ B |
A is a proper subset of B 21 |

A ∪ B |
A union B 24 |

A ∩ B |
A intersection B 25 |

A - B |
difference: elements in A but
not B 27 |

A ⊕ B |
symmetric difference: (A - B) ∪ (B - A) 27 |

A’ |
complement of A 28 |

|A| |
cardinality of A 30 |

[a, b, b, a] |
bag, or multiset, of four ... |

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