Theorem uzind4ALT 9784

Description: Induction on the upper set of integers that starts at an integer 𝑀. The last four hypotheses give us the substitution instances we need; the first two are the basis and the induction step. Either uzind4 9783 or uzind4ALT 9784 may be used; see comment for nnind 9126. (Contributed by NM, 7-Sep-2005.) (New usage is discouraged.) (Proof modification is discouraged.)

Hypotheses

Ref	Expression
uzind4ALT.5	⊢ (𝑀 ∈ ℤ → 𝜓)
uzind4ALT.6	⊢ (𝑘 ∈ (ℤ≥‘𝑀) → (𝜒 → 𝜃))
uzind4ALT.1	⊢ (𝑗 = 𝑀 → (𝜑 ↔ 𝜓))
uzind4ALT.2	⊢ (𝑗 = 𝑘 → (𝜑 ↔ 𝜒))
uzind4ALT.3	⊢ (𝑗 = (𝑘 + 1) → (𝜑 ↔ 𝜃))
uzind4ALT.4	⊢ (𝑗 = 𝑁 → (𝜑 ↔ 𝜏))

Assertion

Ref	Expression
uzind4ALT	⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝜏)

Distinct variable groups:   𝑗,𝑁   𝜓,𝑗   𝜒,𝑗   𝜃,𝑗   𝜏,𝑗   𝜑,𝑘   𝑗,𝑘,𝑀

Allowed substitution hints:   𝜑(𝑗)   𝜓(𝑘)   𝜒(𝑘)   𝜃(𝑘)   𝜏(𝑘)   𝑁(𝑘)

Proof of Theorem uzind4ALT

Step	Hyp	Ref	Expression
1		uzind4ALT.1	. 2 ⊢ (𝑗 = 𝑀 → (𝜑 ↔ 𝜓))
2		uzind4ALT.2	. 2 ⊢ (𝑗 = 𝑘 → (𝜑 ↔ 𝜒))
3		uzind4ALT.3	. 2 ⊢ (𝑗 = (𝑘 + 1) → (𝜑 ↔ 𝜃))
4		uzind4ALT.4	. 2 ⊢ (𝑗 = 𝑁 → (𝜑 ↔ 𝜏))
5		uzind4ALT.5	. 2 ⊢ (𝑀 ∈ ℤ → 𝜓)
6		uzind4ALT.6	. 2 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → (𝜒 → 𝜃))
7	1, 2, 3, 4, 5, 6	uzind4 9783	1 ⊢ (𝑁 ∈ (ℤ≥‘𝑀) → 𝜏)

Syntax hints:   → wi 4   ↔ wb 105   = wceq 1395   ∈ wcel 2200  ‘cfv 5318  (class class class)co 6001  1c1 8000   + caddc 8002  ℤcz 9446  ℤ_≥cuz 9722

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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-cnex 8090  ax-resscn 8091  ax-1cn 8092  ax-1re 8093  ax-icn 8094  ax-addcl 8095  ax-addrcl 8096  ax-mulcl 8097  ax-addcom 8099  ax-addass 8101  ax-distr 8103  ax-i2m1 8104  ax-0lt1 8105  ax-0id 8107  ax-rnegex 8108  ax-cnre 8110  ax-pre-ltirr 8111  ax-pre-ltwlin 8112  ax-pre-lttrn 8113  ax-pre-ltadd 8115

This theorem depends on definitions:  df-bi 117  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-fv 5326  df-riota 5954  df-ov 6004  df-oprab 6005  df-mpo 6006  df-pnf 8183  df-mnf 8184  df-xr 8185  df-ltxr 8186  df-le 8187  df-sub 8319  df-neg 8320  df-inn 9111  df-n0 9370  df-z 9447  df-uz 9723

This theorem is referenced by: (None)