Theorem sucinc 6613

Description: Successor is increasing. (Contributed by Jim Kingdon, 25-Jun-2019.)

Hypothesis

Ref	Expression
sucinc.1	⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)

Assertion

Ref	Expression
sucinc	⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥)

Distinct variable group:   𝑥,𝑧

Allowed substitution hints:   𝐹(𝑥,𝑧)

Proof of Theorem sucinc

Step	Hyp	Ref	Expression
1		sssucid 4512	. . 3 ⊢ 𝑥 ⊆ suc 𝑥
2		vex 2805	. . . 4 ⊢ 𝑥 ∈ V
3	2	sucex 4597	. . . 4 ⊢ suc 𝑥 ∈ V
4		suceq 4499	. . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥)
5		sucinc.1	. . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
6	4, 5	fvmptg 5722	. . . 4 ⊢ ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹‘𝑥) = suc 𝑥)
7	2, 3, 6	mp2an 426	. . 3 ⊢ (𝐹‘𝑥) = suc 𝑥
8	1, 7	sseqtrri 3262	. 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥)
9	8	ax-gen 1497	1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥)

Syntax hints:  ∀wal 1395   = wceq 1397   ∈ wcel 2202  Vcvv 2802   ⊆ wss 3200   ↦ cmpt 4150  suc csuc 4462  ‘cfv 5326

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-suc 4468  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334

This theorem is referenced by: (None)