Join: Another Form of Composition
Other forms of composition of relations, which apply to general n-place relations instead of binary relations, are found in the join operation of relational algebra. The usual composition of two binary relations as defined here can be obtained by taking their join, leading to a ternary relation, followed by a projection that removes the middle component.
Read more about this topic: Composition Of Relations
Famous quotes containing the words form and/or composition:
“I am afraid I am one of those people who continues to read in the hope of sometime discovering in a book a single—and singular—piece of wisdom so penetrating, so soul stirring, so utterly applicable to my own life as to make all the bad books I have read seem well worth the countless hours spent on them. My guess is that this wisdom, if it ever arrives, will do so in the form of a generalization.”
—Joseph Epstein (b. 1937)
“Vices enter into the composition of virtues as poisons into the composition of certain medicines. Prudence and common sense mix them together, and make excellent use of them against the misfortunes that attend human life.”
—François, Duc De La Rochefoucauld (1613–1680)