רוסית ⇄ אנגלית

доказательство от обратного מתח
.הִגָי	reductio ad absurdam (Alex_Odeychuk); reduction to absurdity (Alex_Odeychuk)
.מָתֵי	proof by contradiction, by reductio ad absurdum proof; proof by contradiction; reductio ad absurdum proof