+ i / e i E (-1) λ . ∘ id domain codomain image {   if   ⌊ / ⌋ ! / max max − − ( − + ) mod ( × ) gcd ∧ ∨ xor ¬ ⇒ ∀ . ∃ . | | ¯ arg ℛ ℑ lcm ⌊ ⌋ ⌈ ⌉ = ≠ > < ≥ ≤ ≡ ≃ | ∫ d ′ d d d d D , ∂ + + ∂ , div grad curl ∇2 ∪ ∩ ∈ ∉ ⊆ ⊂ ⊈ ⊄ ∖ | | × ∑ ∏ limit → ↘ ↗ → → e log log 〈 , 〉 σ σ ( ) 2 median mode 〈 〉 ( ) ( ) det | | T , . Z R Q N C P e i NaN true false ∅ π γ ∞ ( ) ( ) | ,