Symbol
The mathematical symbol for logical disjunction varies in the literature. In addition to the word "or", and the formula "Apq", the symbol "", deriving from the Latin word vel for "or", is commonly used for disjunction. For example: "A B " is read as "A or B ". Such a disjunction is false if both A and B are false. In all other cases it is true.
All of the following are disjunctions:
The corresponding operation in set theory is the set-theoretic union.
Read more about this topic: Logical Disjunction
Famous quotes containing the word symbol:
“The symbol of perpetual youth, the grass-blade, like a long green ribbon, streams from the sod into the summer, checked indeed by the frost, but anon pushing on again, lifting its spear of last year’s hay with the fresh life below. It grows as steadily as the rill oozes out of the ground.... So our human life but dies down to its root, and still puts forth its green blade to eternity.”
—Henry David Thoreau (1817–1862)
“The truth has never been of any real value to any human being—it is a symbol for mathematicians and philosophers to pursue. In human relations kindness and lies are worth a thousand truths.”
—Graham Greene (1904–1991)
“Dylan is to me the perfect symbol of the anti-artist in our society. He is against everything—the last resort of someone who doesn’t really want to change the world.... Dylan’s songs accept the world as it is.”
—Ewan MacColl (1915–1989)