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Conjunction has "conjunct".
Disjunction has "disjunct".
Implication has "antecedent" and "consequent".

Does the operand of negation have a name?

Isaac Sechslingloff
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    Negated sentence/formula? – Mauro ALLEGRANZA Jul 25 '22 at 10:01
  • My best suggestion is "negation input". I have a related question: do the left and right sides of a biconditional have their own names too? Please ping me if answering this. – ryang Jul 25 '22 at 11:11
  • @ryang I recommend (but have never seen, sadly) "dextrant" and "sinistrant." – Noah Schweber Jul 25 '22 at 21:36
  • @NoahSchweber Okay, the root meaning of "dex" is right/good, and the root meaning of "sini" is my, whereas "trant" means entrant/input, right? This is even more obscure than 'negand'. – ryang Jul 26 '22 at 03:26

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The operand of negation is the negand. I do not think it is a very commmon word, but this site cites a few sources in which it is used.

jacob
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    The -end/-and suffixes, meaning "that which does or receives an action", fills a lot of obscure corners. "Repetend" is the name for the repeating part of a repeating decimal. A sum has two "addends", while a subtraction has a "minuend" and a "subtrahend". – JonathanZ Jul 26 '22 at 02:14
  • Ah, nice. Google didn't suggest this word when I searched for "negant" and "negatant" before. 2:20 of this video uses this word. – ryang Jul 26 '22 at 03:21