Logical connective
History of notations

Some authors used letters for connectives: u. {\displaystyle \operatorname {u.} } for conjunction (German's "und" for "and") and o. {\displaystyle \operatorname {o.} } for disjunction (German's "oder" for "or") in early works by Hilbert (1904); N p {\displaystyle Np} for negation, K p q {\displaystyle Kpq} for conjunction, D p q {\displaystyle Dpq} for alternative denial, A p q {\displaystyle Apq} for disjunction, C p q {\displaystyle Cpq} for implication, E p q {\displaystyle Epq} for biconditional in Łukasiewicz in 1929.
change_case:english_capital