ฟังก์ชันหนึ่งต่อหนึ่ง

An injection is a type of mathematical function where each input produces a unique output—no two different inputs map to the same output. This matters because injections are fundamental building blocks in mathematics that help us understand how sets relate to each other and whether information is preserved without loss when transforming data from one form to another.

AI-generated from the Wikipedia summary — may contain errors.