law of contradiction; principle of non-contradiction
In classical logic, the principle that a proposition cannot be both true and false at the same time and in the same respect.
The law of contradiction is one of the fundamental principles of logic formulated by Aristotle.
同一律 (law of identity) states that each thing is the same with itself, whereas 矛盾律 deals with the impossibility of contradictory statements being simultaneously true.
From 矛盾 (contradiction) + 律 (law, rule). 矛盾 itself originates from an ancient Chinese parable about a merchant who claimed to sell an unbreakable shield and an all-piercing spear, highlighting the logical impossibility of both claims being true.