Logical operations

Disco has various standard operations for manipulating Boolean values.

• Logical negation is written not; it inverts true to false and vice versa.

• Logical conjunction, aka AND, is written /\, and, or &&. It has the following truth table:

  x	y	x /\ y
  F	F	F
  F	T	F
  T	F	F
  T	T	T

• Logical disjunction, aka OR, is written \/, or, or ||. It has the following truth table:

  x	y	x \/ y
  F	F	F
  F	T	T
  T	F	T
  T	T	T

• Logical implication, aka IF-THEN, is written ->, ==>, or implies. It has the following truth table:

  x	y	x -> y
  F	F	T
  F	T	T
  T	F	F
  T	T	T

• Biconditional, aka “if and only if”, is written <->, <==>, or iff. It has the following truth table:

  x	y	x <-> y
  F	F	T
  F	T	F
  T	F	F
  T	T	T