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Theorem dfuzi 9503
Description: An expression for the upper integers that start at 𝑁 that is analogous to dfnn2 9058 for positive integers. (Contributed by NM, 6-Jul-2005.) (Proof shortened by Mario Carneiro, 3-May-2014.)
Hypothesis
Ref Expression
dfuz.1 𝑁 ∈ ℤ
Assertion
Ref Expression
dfuzi {𝑧 ∈ ℤ ∣ 𝑁𝑧} = {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)}
Distinct variable group:   𝑥,𝑦,𝑧,𝑁

Proof of Theorem dfuzi
StepHypRef Expression
1 ssintab 3908 . . 3 ({𝑧 ∈ ℤ ∣ 𝑁𝑧} ⊆ {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)} ↔ ∀𝑥((𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥) → {𝑧 ∈ ℤ ∣ 𝑁𝑧} ⊆ 𝑥))
2 dfuz.1 . . . 4 𝑁 ∈ ℤ
32peano5uzi 9502 . . 3 ((𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥) → {𝑧 ∈ ℤ ∣ 𝑁𝑧} ⊆ 𝑥)
41, 3mpgbir 1477 . 2 {𝑧 ∈ ℤ ∣ 𝑁𝑧} ⊆ {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)}
52zrei 9398 . . . . . 6 𝑁 ∈ ℝ
65leidi 8578 . . . . 5 𝑁𝑁
7 breq2 4055 . . . . . 6 (𝑧 = 𝑁 → (𝑁𝑧𝑁𝑁))
87elrab 2933 . . . . 5 (𝑁 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} ↔ (𝑁 ∈ ℤ ∧ 𝑁𝑁))
92, 6, 8mpbir2an 945 . . . 4 𝑁 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}
10 peano2uz2 9500 . . . . . 6 ((𝑁 ∈ ℤ ∧ 𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}) → (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧})
112, 10mpan 424 . . . . 5 (𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} → (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧})
1211rgen 2560 . . . 4 𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}
13 zex 9401 . . . . . 6 ℤ ∈ V
1413rabex 4196 . . . . 5 {𝑧 ∈ ℤ ∣ 𝑁𝑧} ∈ V
15 eleq2 2270 . . . . . 6 (𝑥 = {𝑧 ∈ ℤ ∣ 𝑁𝑧} → (𝑁𝑥𝑁 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}))
16 eleq2 2270 . . . . . . 7 (𝑥 = {𝑧 ∈ ℤ ∣ 𝑁𝑧} → ((𝑦 + 1) ∈ 𝑥 ↔ (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}))
1716raleqbi1dv 2715 . . . . . 6 (𝑥 = {𝑧 ∈ ℤ ∣ 𝑁𝑧} → (∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥 ↔ ∀𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}))
1815, 17anbi12d 473 . . . . 5 (𝑥 = {𝑧 ∈ ℤ ∣ 𝑁𝑧} → ((𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥) ↔ (𝑁 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} ∧ ∀𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧})))
1914, 18elab 2921 . . . 4 ({𝑧 ∈ ℤ ∣ 𝑁𝑧} ∈ {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)} ↔ (𝑁 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} ∧ ∀𝑦 ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧} (𝑦 + 1) ∈ {𝑧 ∈ ℤ ∣ 𝑁𝑧}))
209, 12, 19mpbir2an 945 . . 3 {𝑧 ∈ ℤ ∣ 𝑁𝑧} ∈ {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)}
21 intss1 3906 . . 3 ({𝑧 ∈ ℤ ∣ 𝑁𝑧} ∈ {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)} → {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)} ⊆ {𝑧 ∈ ℤ ∣ 𝑁𝑧})
2220, 21ax-mp 5 . 2 {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)} ⊆ {𝑧 ∈ ℤ ∣ 𝑁𝑧}
234, 22eqssi 3213 1 {𝑧 ∈ ℤ ∣ 𝑁𝑧} = {𝑥 ∣ (𝑁𝑥 ∧ ∀𝑦𝑥 (𝑦 + 1) ∈ 𝑥)}
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1373  wcel 2177  {cab 2192  wral 2485  {crab 2489  wss 3170   cint 3891   class class class wbr 4051  (class class class)co 5957  1c1 7946   + caddc 7948  cle 8128  cz 9392
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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4170  ax-pow 4226  ax-pr 4261  ax-un 4488  ax-setind 4593  ax-cnex 8036  ax-resscn 8037  ax-1cn 8038  ax-1re 8039  ax-icn 8040  ax-addcl 8041  ax-addrcl 8042  ax-mulcl 8043  ax-addcom 8045  ax-addass 8047  ax-distr 8049  ax-i2m1 8050  ax-0lt1 8051  ax-0id 8053  ax-rnegex 8054  ax-cnre 8056  ax-pre-ltirr 8057  ax-pre-ltwlin 8058  ax-pre-lttrn 8059  ax-pre-ltadd 8061
This theorem depends on definitions:  df-bi 117  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ne 2378  df-nel 2473  df-ral 2490  df-rex 2491  df-reu 2492  df-rab 2494  df-v 2775  df-sbc 3003  df-dif 3172  df-un 3174  df-in 3176  df-ss 3183  df-pw 3623  df-sn 3644  df-pr 3645  df-op 3647  df-uni 3857  df-int 3892  df-br 4052  df-opab 4114  df-id 4348  df-xp 4689  df-rel 4690  df-cnv 4691  df-co 4692  df-dm 4693  df-iota 5241  df-fun 5282  df-fv 5288  df-riota 5912  df-ov 5960  df-oprab 5961  df-mpo 5962  df-pnf 8129  df-mnf 8130  df-xr 8131  df-ltxr 8132  df-le 8133  df-sub 8265  df-neg 8266  df-inn 9057  df-n0 9316  df-z 9393
This theorem is referenced by: (None)
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