Theorem sucinc 6712

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 4558	. . 3 ⊢ 𝑥 ⊆ suc 𝑥
2		vex 2824	. . . 4 ⊢ 𝑥 ∈ V
3	2	sucex 4644	. . . 4 ⊢ suc 𝑥 ∈ V
4		suceq 4545	. . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥)
5		sucinc.1	. . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
6	4, 5	fvmptg 5778	. . . 4 ⊢ ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹‘𝑥) = suc 𝑥)
7	2, 3, 6	mp2an 430	. . 3 ⊢ (𝐹‘𝑥) = suc 𝑥
8	1, 7	sseqtrri 3283	. 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥)
9	8	ax-gen 1502	1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥)

Syntax hints:  ∀wal 1400   = wceq 1402   ∈ wcel 2209  Vcvv 2821   ⊆ wss 3220   ↦ cmpt 4190  suc csuc 4508  ‘cfv 5375

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-suc 4514  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-iota 5335  df-fun 5377  df-fv 5383

This theorem is referenced by: (None)