symmetric difference
(i) A+A = Ø, A+Ø = A, A+A′ = E, A+E = A′.
(ii) A+B = (A ∪ B)∖(A ∩ B)= (A ∪ B) ∩ (A′ ∪ B′).
(iii) A+B = B+A, the commutative law.
(iv) (A+B)+C = A+(B+C), the associative law.
(v) A ∩ (B+C) = (A ∩ B)+(A ∩ C), the operation ∩ is distributive over the operation+.
The symmetric difference AΔB
- directional derivative
- direction angles
- direction cosines
- direction fields
- direction ratios
- direct isometry
- directly proportional
- direct product
- direct proof
- directrix
- direct sum
- direct variation
- Dirichlet beta function
- Dirichlet function
- Dirichlet, Peter Gustav Lejeune
- Dirichlet problem
- Dirichlet's approximation theorem
- Dirichlet series
- Dirichlet's test
- disc
- disc of convergence
- disconnected
- discontinuity
- discontinuous function
- discrete