Nota: A tradução desta entrada está atualmente em revisão de qualidade, portanto parte do conteúdo é exibida temporariamente apenas em inglês.
Este verbete ainda não foi traduzido para o seu idioma, portanto o original é exibido abaixo.
q.e.d.
This term functions as a formal signal of closure, typically appearing as a standalone marker at the conclusion of a rigorous logical sequence. It carries a tone of absolute certainty and intellectual triumph, serving as a linguistic seal that prevents further debate by asserting that the goal of the proof has been reached.
Because it is an abbreviation of the Latin phrase quod erat demonstrandum, it is treated as an invariant adverbial marker. It does not undergo inflection or modification and is almost exclusively confined to academic, mathematical, and philosophical texts, where it marks the transition from active derivation to a state of proven fact.