Theorem sucinc 6677

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 4535	. . 3 ⊢ 𝑥 ⊆ suc 𝑥
2		vex 2815	. . . 4 ⊢ 𝑥 ∈ V
3	2	sucex 4620	. . . 4 ⊢ suc 𝑥 ∈ V
4		suceq 4522	. . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥)
5		sucinc.1	. . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
6	4, 5	fvmptg 5752	. . . 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 3272	. 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥)
9	8	ax-gen 1498	1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥)

Syntax hints:  ∀wal 1396   = wceq 1398   ∈ wcel 2203  Vcvv 2812   ⊆ wss 3210   ↦ cmpt 4170  suc csuc 4485  ‘cfv 5351

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321  ax-un 4553

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2814  df-sbc 3042  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-br 4109  df-opab 4171  df-mpt 4172  df-id 4413  df-suc 4491  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-iota 5311  df-fun 5353  df-fv 5359

This theorem is referenced by: (None)