Definition df-image 34774

Description: Define the image functor. This function takes a set 𝐴 to a function 𝑥 ↦ (𝐴 “ 𝑥), providing that the latter exists. See imageval 34840 for the derivation. (Contributed by Scott Fenton, 27-Mar-2014.)

Assertion

Ref	Expression
df-image	⊢ Image𝐴 = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V)))

Detailed syntax breakdown of Definition df-image

Step	Hyp	Ref	Expression
1		cA	. . 3 class 𝐴
2	1	cimage 34750	. 2 class Image𝐴
3		cvv 3475	. . . 4 class V
4	3, 3	cxp 5673	. . 3 class (V × V)
5		cep 5578	. . . . . 6 class E
6	3, 5	ctxp 34740	. . . . 5 class (V ⊗ E )
7	1	ccnv 5674	. . . . . . 7 class ◡𝐴
8	5, 7	ccom 5679	. . . . . 6 class ( E ∘ ◡𝐴)
9	8, 3	ctxp 34740	. . . . 5 class (( E ∘ ◡𝐴) ⊗ V)
10	6, 9	csymdif 4240	. . . 4 class ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V))
11	10	crn 5676	. . 3 class ran ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V))
12	4, 11	cdif 3944	. 2 class ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V)))
13	2, 12	wceq 1542	1 wff Image𝐴 = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ ◡𝐴) ⊗ V)))

This definition is referenced by:  brimage  34836  funimage  34838