e - + ⁢ ⅈ - + ⁢ ⅈ Polar ⁢ Polar ⁢ ⁡ [ ] -1 λ ⁡ ∘ ∘ id id domain codomain image ⁡ { if otherwise ⌊ ⌋ e ! max min max min | - - - + ⁢ gcd lcm gcd lcm ⁡ ∧ ⁡ ∨ ⁡ ⊻ ⁡ ¬ ⁡ ¬ ⁡ ∀ : , ∃ : , ¯ ℜ ℑ ⁡ ⌊ ⌈ ⌋ ⌉ ≠ ≈ ∣ ↘ ↗ → ⇒ ∈ ∉ ⊄ ⊈ ⊆ ⊂ ≥ ≤ ≡ ln ln log log log log d d d d ′ ⅅ ∂ ∂ ∂ ∂ ∂ ∂ ∇ 2 ⁡ | ∪ ∩ \ × ∑ ∏ = ∑ ∏ ∑ ∏ ∫ ∫ ∫ ∫ ∫ d lim → σ σ 2 median mode det T × ⋅ ⊗ ℤ ℝ ℚ ℕ ℂ ℙ e ⅈ NaN true false ∅ π ℽ ∞