An e such that for all x∈S, e*x=x*e=x
(chk) ∀a, ∃e such that a*e = e*a = a를 만족하는. 이 때 e가 항등원.
덧셈,addition의 항등원 = 0 (∵ x+0=0+x=x)
곱셈,multiplication의 항등원 = 1
...
각각
곱셈,multiplication의 항등원 = 1
...
각각
덧셈항등원,additive_identity https://mathworld.wolfram.com/AdditiveIdentity.html
맞는지?덧셈에 대한 항등원?
덧셈,addition
보통 영,zero
체,field의 조건 중 하나?
https://en.wiktionary.org/wiki/additive_identity#English
https://en.wikipedia.org/wiki/Additive_identity
곱셈항등원,multiplicative_identity https://mathworld.wolfram.com/MultiplicativeIdentity.html덧셈,addition
보통 영,zero
체,field의 조건 중 하나?
https://en.wiktionary.org/wiki/additive_identity#English
https://en.wikipedia.org/wiki/Additive_identity
left identity
left identity element
https://proofwiki.org/wiki/Definition:Left_Identity
right identity
right identity element
https://proofwiki.org/wiki/Definition:Right_Identity
two-sided identity
two-sided identity element
https://proofwiki.org/wiki/Definition:Identity_Element
https://planetmath.org/leftidentityandrightidentity
... left identity right identity
left identity element
https://proofwiki.org/wiki/Definition:Left_Identity
right identity
right identity element
https://proofwiki.org/wiki/Definition:Right_Identity
two-sided identity
two-sided identity element
https://proofwiki.org/wiki/Definition:Identity_Element
https://planetmath.org/leftidentityandrightidentity
... left identity right identity
ADDIDENTITYHERE
Twins:
수학백과: 항등원
https://planetmath.org/identityelement - syn. neutral element
https://en.citizendium.org/wiki/Identity_element
https://encyclopediaofmath.org/wiki/Identity_element - neutral element, unit element, zero element
Identity_element
https://ncatlab.org/nlab/show/identity element - "sometimes also called neutral element"
https://groupprops.subwiki.org/wiki/Identity_element
수학백과: 항등원
https://planetmath.org/identityelement - syn. neutral element
https://en.citizendium.org/wiki/Identity_element
https://encyclopediaofmath.org/wiki/Identity_element - neutral element, unit element, zero element
Identity_element
https://ncatlab.org/nlab/show/identity element - "sometimes also called neutral element"
https://groupprops.subwiki.org/wiki/Identity_element
// forked from 항등식,identity... 항등- (identity-) 관련으로 분류? see 항등식.