Theorem sucinc 6680

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 4538	. . 3 ⊢ 𝑥 ⊆ suc 𝑥
2		vex 2818	. . . 4 ⊢ 𝑥 ∈ V
3	2	sucex 4623	. . . 4 ⊢ suc 𝑥 ∈ V
4		suceq 4525	. . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥)
5		sucinc.1	. . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
6	4, 5	fvmptg 5755	. . . 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 3275	. 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥)
9	8	ax-gen 1498	1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥)

Syntax hints:  ∀wal 1396   = wceq 1398   ∈ wcel 2205  Vcvv 2815   ⊆ wss 3213   ↦ cmpt 4173  suc csuc 4488  ‘cfv 5354

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 2207  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3045  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-suc 4494  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-iota 5314  df-fun 5356  df-fv 5362

This theorem is referenced by: (None)