단사,injection - VeryGoodWiki

For
전사,surjection 전사함수,surjective_function
단사,injection 단사함수,injective_function
전단사,bijection 전단사함수,bijective_function

injective adj.

curr. see: 함수,function#s-5 and/or 사상,map

chk: 일대일,one-to-one = injective 완벽히 같은 거 맞는지?

https://mathworld.wolfram.com/One-to-One.html

sub?
단사함수,injective_function = 일대일함수,one-to-one_function - curr at 함수,function#s-5.1
단사조각? injective_patch — 조각,patch (미분기하학,differential_geometry)

tbw: 판정법,test > horizontal line test 와의 밀접한 관련성?? chk - 을 적을 것

chk, tmp from https://blog.naver.com/hafs_snu/221085743625
{
단사함수의 정의
각각의 $y\in Y$ 에 대해 $f(x)=y$ 를 만족하는 $x\in X$ 가 최대 한 개 뿐이다. (0개 또는 1개)
$\forall x_1 \forall x_2 (f(x_1)=f(x_2)) \to (x_1=x_2)$
}

https://planetmath.org/injectivefunction
https://encyclopediaofmath.org/wiki/Injection
http://foldoc.org/injection
https://artofproblemsolving.com/wiki/index.php/Injection
https://ncatlab.org/nlab/show/injection

tmp

https://everything2.com/title/injection
https://everything2.com/title/injective
https://en.citizendium.org/wiki/Injective_function