同どう語ご反はん復ぷく

noun

tautology (linguistics)

In linguistics, the unnecessary repetition of an idea in different words, e.g. 'a beginner who has just started'.

• 「頭ず痛つうが痛いたい」は同どう語ご反はん復ぷくの例れいだ。

  'My headache hurts' is an example of tautology.

noun

tautology (logic)

In logic, a statement that is always true by virtue of its logical form, e.g. 'A or not A'. Cross-referenced with 恒真式.

See also: 恒真式

• 論ろん理り学がくでは、「PまたはPでない」は同どう語ご反はん復ぷくである。

  In logic, 'P or not P' is a tautology.