In knot theory, a virtual knot is a generalization of the classical idea of knots in several ways that are all equivalent, introduced by Kauffman (1999).
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Famous quotes containing the words virtual and/or knot:
“Tragedy dramatizes human life as potentiality and fulfillment. Its virtual future, or Destiny, is therefore quite different from that created in comedy. Comic Destiny is Fortune—what the world will bring, and the man will take or miss, encounter or escape; tragic Destiny is what the man brings, and the world will demand of him. That is his Fate.”
—Susanne K. Langer (1895–1985)
“O time, thou must untangle this, not I.
It is too hard a knot for me t’untie.”
—William Shakespeare (1564–1616)