→ | Implies |

↔ | Implies and implied by |

< | Less than |

≤ | Less than or equal to |

> | Greater than |

≥ | Greater than or equal to |

C | The set of complex numbers |

ℝ | The set of real numbers |

Q |
The set of rational numbers |

Z |
The set of integers |

ℕ | The set of natural numbers |

∈ | Is an element of |

⊆ | Is a subset of |

∪ | Union |

∩ | Intersection |

[a, b] |
{x ∈ ℝ : a ≤ x ≤ b} |

(a, b) |
{x ∈ ℝ : a < x < b} |

(a, b] |
{x ∈ ℝ : a < x ≤ b} |

[a, b) |
{x ∈ ℝ : a ≤ x < b} |

(r, ∞) |
{x ∈ ℝ : r < x} |

[r, ∞) |
{x ∈ ℝ : r ≤ x} |

(−∞, r) |
{x ∈ ℝ : x < r} |

(−∞, r] |
{x ∈ ℝ : x ≤ r} |

P(A) |
The power set of A = The set of all subsets of A |

a R b |
a is related to b under the relation R |

[x] |
The equivalence class of x under the equivalence ... |

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