law of transposition

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Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden

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The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)

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The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

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The Prado Museum facade at the Diego Velaszquez memorial. Established in 1819, the museum is considered the best collection of Spanish art and one of the world's finest collections of European art. Madrid, Spain

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law of transposition

logic

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manipulations in LPC

In formal logic: Logical manipulations in LPC
…follow from these by the law of transposition; e.g., since (a) ⊃ (b) is valid, so is ∼(b) ⊃ ∼(a). The quantification of wffs containing three, four, etc., variables can be dealt with by the same rules.
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