Theorem wfximgfd 44270

Description: The value of a function on its domain is in the image of the function. (Contributed by Stanislas Polu, 9-Mar-2020.)

Hypotheses

Ref	Expression
wfximgfd.1	⊢ (𝜑 → 𝐶 ∈ 𝐴)
wfximgfd.2	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)

Assertion

Ref	Expression
wfximgfd	⊢ (𝜑 → (𝐹‘𝐶) ∈ (𝐹 “ 𝐴))

Proof of Theorem wfximgfd

Step	Hyp	Ref	Expression
1		wfximgfd.2	. . 3 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
2	1	ffnd 6660	. 2 ⊢ (𝜑 → 𝐹 Fn 𝐴)
3		wfximgfd.1	. 2 ⊢ (𝜑 → 𝐶 ∈ 𝐴)
4	2, 3, 3	fnfvimad 7177	1 ⊢ (𝜑 → (𝐹‘𝐶) ∈ (𝐹 “ 𝐴))

Syntax hints:   → wi 4   ∈ wcel 2113   “ cima 5624  ⟶wf 6485  ‘cfv 6489

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-12 2182  ax-ext 2705  ax-sep 5238  ax-nul 5248  ax-pr 5374

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-ne 2931  df-ral 3050  df-rex 3059  df-rab 3398  df-v 3440  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4285  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4861  df-br 5096  df-opab 5158  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-res 5633  df-ima 5634  df-iota 6445  df-fun 6491  df-fn 6492  df-f 6493  df-fv 6497

This theorem is referenced by:  imo72b2lem0  44272