Proof of Theorem nnunb
| Step | Hyp | Ref
| Expression |
| 1 | | pm3.24 496 |
. . . . . 6
⊢ ¬ (∀y ∈ ℕ ¬ x < y ∧
¬ ∀y ∈ ℕ ¬
x < y) |
| 2 | | oprex 3018 |
. . . . . . . . . . . . . . 15
⊢ (x
− 1) ∈ V |
| 3 | | eleq1 1149 |
. . . . . . . . . . . . . . . 16
⊢ (y =
(x − 1) → (y ∈ ℝ ↔ (x − 1) ∈ ℝ)) |
| 4 | | breq1 2065 |
. . . . . . . . . . . . . . . . 17
⊢ (y =
(x − 1) → (y < x ↔
(x − 1) < x)) |
| 5 | | breq1 2065 |
. . . . . . . . . . . . . . . . . 18
⊢ (y =
(x − 1) → (y < z ↔
(x − 1) < z)) |
| 6 | 5 | birexdv 1220 |
. . . . . . . . . . . . . . . . 17
⊢ (y =
(x − 1) → (∃z ∈ ℕ y < z ↔
∃z ∈ ℕ (x − 1) < z)) |
| 7 | 4, 6 | imbi12d 474 |
. . . . . . . . . . . . . . . 16
⊢ (y =
(x − 1) → ((y < x →
∃z ∈ ℕ y < z) ↔
((x − 1) < x → ∃z ∈ ℕ (x − 1) < z))) |
| 8 | 3, 7 | imbi12d 474 |
. . . . . . . . . . . . . . 15
⊢ (y =
(x − 1) → ((y ∈ ℝ → (y < x →
∃z ∈ ℕ y < z))
↔ ((x − 1) ∈ ℝ →
((x − 1) < x → ∃z ∈ ℕ (x − 1) < z)))) |
| 9 | 2, 8 | cla4v 1400 |
. . . . . . . . . . . . . 14
⊢ (∀y(y ∈
ℝ → (y < x → ∃z ∈ ℕ y < z))
→ ((x − 1) ∈ ℝ →
((x − 1) < x → ∃z ∈ ℕ (x − 1) < z))) |
| 10 | | ltplus1t 4383 |
. . . . . . . . . . . . . . 15
⊢ (x
∈ ℝ → x < (x + 1)) |
| 11 | | ax1re 4064 |
. . . . . . . . . . . . . . . . 17
⊢ 1 ∈ ℝ |
| 12 | | ltsubaddt 4353 |
. . . . . . . . . . . . . . . . 17
⊢ ((x
∈ ℝ ∧ 1 ∈ ℝ ∧ x ∈ ℝ) → ((x − 1) < x ↔ x <
(x + 1))) |
| 13 | 11, 12 | mp3an2 640 |
. . . . . . . . . . . . . . . 16
⊢ ((x
∈ ℝ ∧ x ∈ ℝ)
→ ((x − 1) < x ↔ x <
(x + 1))) |
| 14 | 13 | anidms 332 |
. . . . . . . . . . . . . . 15
⊢ (x
∈ ℝ → ((x − 1) <
x ↔ x < (x +
1))) |
| 15 | 10, 14 | mpbird 171 |
. . . . . . . . . . . . . 14
⊢ (x
∈ ℝ → (x − 1) <
x) |
| 16 | 9, 15 | syl7 24 |
. . . . . . . . . . . . 13
⊢ (∀y(y ∈
ℝ → (y < x → ∃z ∈ ℕ y < z))
→ ((x − 1) ∈ ℝ →
(x ∈ ℝ → ∃z ∈ ℕ (x − 1) < z))) |
| 17 | | resubclt 4173 |
. . . . . . . . . . . . . 14
⊢ ((x
∈ ℝ ∧ 1 ∈ ℝ) → (x − 1) ∈ ℝ) |
| 18 | 11, 17 | mpan2 519 |
. . . . . . . . . . . . 13
⊢ (x
∈ ℝ → (x − 1) ∈
ℝ) |
| 19 | 16, 18 | syl5 22 |
. . . . . . . . . . . 12
⊢ (∀y(y ∈
ℝ → (y < x → ∃z ∈ ℕ y < z))
→ (x ∈ ℝ → (x ∈ ℝ → ∃z ∈ ℕ (x − 1) < z))) |
| 20 | 19 | pm2.43d 59 |
. . . . . . . . . . 11
⊢ (∀y(y ∈
ℝ → (y < x → ∃z ∈ ℕ y < z))
→ (x ∈ ℝ →
∃z ∈ ℕ (x − 1) < z)) |
| 21 | | df-rex 1206 |
. . . . . . . . . . 11
⊢ (∃z ∈ ℕ (x − 1) < z ↔ ∃z(z ∈
ℕ ∧ (x − 1) < z)) |
| 22 | 20, 21 | syl6ib 185 |
. . . . . . . . . 10
⊢ (∀y(y ∈
ℝ → (y < x → ∃z ∈ ℕ y < z))
→ (x ∈ ℝ →
∃z(z ∈ ℕ ∧ (x − 1) < z))) |
| 23 | 22 | com12 13 |
. . . . . . . . 9
⊢ (x
∈ ℝ → (∀y(y ∈ ℝ → (y < x →
∃z ∈ ℕ y < z))
→ ∃z(z ∈ ℕ ∧ (x − 1) < z))) |
| 24 | | ltsubaddt 4353 |
. . . . . . . . . . . . . . 15
⊢ ((x
∈ ℝ ∧ 1 ∈ ℝ ∧ z ∈ ℝ) → ((x − 1) < z ↔ x <
(z + 1))) |
| 25 | 11, 24 | mp3an2 640 |
. . . . . . . . . . . . . 14
⊢ ((x
∈ ℝ ∧ z ∈ ℝ)
→ ((x − 1) < z ↔ x <
(z + 1))) |
| 26 | | nnret 4427 |
. . . . . . . . . . . . . 14
⊢ (z
∈ ℕ → z ∈
ℝ) |
| 27 | 25, 26 | sylan2 346 |
. . . . . . . . . . . . 13
⊢ ((x
∈ ℝ ∧ z ∈ ℕ)
→ ((x − 1) < z ↔ x <
(z + 1))) |
| 28 | 27 | exp 291 |
. . . . . . . . . . . 12
⊢ (x
∈ ℝ → (z ∈ ℕ
→ ((x − 1) < z ↔ x <
(z + 1)))) |
| 29 | 28 | pm5.32d 491 |
. . . . . . . . . . 11
⊢ (x
∈ ℝ → ((z ∈ ℕ
∧ (x − 1) < z) ↔ (z
∈ ℕ ∧ x < (z + 1)))) |
| 30 | 29 | biexdv 936 |
. . . . . . . . . 10
⊢ (x
∈ ℝ → (∃z(z ∈ ℕ ∧ (x − 1) < z) ↔ ∃z(z ∈
ℕ ∧ x < (z + 1)))) |
| 31 | | oprex 3018 |
. . . . . . . . . . . . 13
⊢ (z +
1) ∈ V |
| 32 | | eleq1 1149 |
. . . . . . . . . . . . . 14
⊢ (y =
(z + 1) → (y ∈ ℕ ↔ (z + 1) ∈ ℕ)) |
| 33 | | breq2 2066 |
. . . . . . . . . . . . . 14
⊢ (y =
(z + 1) → (x < y ↔
x < (z + 1))) |
| 34 | 32, 33 | anbi12d 476 |
. . . . . . . . . . . . 13
⊢ (y =
(z + 1) → ((y ∈ ℕ ∧ x < y) ↔
((z + 1) ∈ ℕ ∧ x < (z +
1)))) |
| 35 | 31, 34 | cla4ev 1401 |
. . . . . . . . . . . 12
⊢ (((z +
1) ∈ ℕ ∧ x < (z + 1)) → ∃y(y ∈
ℕ ∧ x < y)) |
| 36 | | peano2nn 4433 |
. . . . . . . . . . . 12
⊢ (z
∈ ℕ → (z + 1) ∈
ℕ) |
| 37 | 35, 36 | sylan 343 |
. . . . . . . . . . 11
⊢ ((z
∈ ℕ ∧ x < (z + 1)) → ∃y(y ∈
ℕ ∧ x < y)) |
| 38 | 37 | 19.23aiv 952 |
. . . . . . . . . 10
⊢ (∃z(z ∈
ℕ ∧ x < (z + 1)) → ∃y(y ∈
ℕ ∧ x < y)) |
| 39 | 30, 38 | syl6bi 187 |
. . . . . . . . 9
⊢ (x
∈ ℝ → (∃z(z ∈ ℕ ∧ (x − 1) < z) → ∃y(y ∈
ℕ ∧ x < y))) |
| 40 | 23, 39 | syld 27 |
. . . . . . . 8
⊢ (x
∈ ℝ → (∀y(y ∈ ℝ → (y < x →
∃z ∈ ℕ y < z))
→ ∃y(y ∈ ℕ ∧ x < y))) |
| 41 | | df-ral 1205 |
. . . . . . . 8
⊢ (∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z) ↔
∀y(y ∈ ℝ → (y < x →
∃z ∈ ℕ y < z))) |
| 42 | | df-ral 1205 |
. . . . . . . . . 10
⊢ (∀y ∈ ℕ ¬ x < y ↔
∀y(y ∈ ℕ → ¬ x < y)) |
| 43 | | alinexa 724 |
. . . . . . . . . 10
⊢ (∀y(y ∈
ℕ → ¬ x < y) ↔ ¬ ∃y(y ∈
ℕ ∧ x < y)) |
| 44 | 42, 43 | bitr2 152 |
. . . . . . . . 9
⊢ (¬ ∃y(y ∈
ℕ ∧ x < y) ↔ ∀y ∈ ℕ ¬ x < y) |
| 45 | 44 | bicon1i 193 |
. . . . . . . 8
⊢ (¬ ∀y ∈ ℕ ¬ x < y ↔
∃y(y ∈ ℕ ∧ x < y)) |
| 46 | 40, 41, 45 | 3imtr4g 426 |
. . . . . . 7
⊢ (x
∈ ℝ → (∀y ∈
ℝ (y < x → ∃z ∈ ℕ y < z) →
¬ ∀y ∈ ℕ ¬
x < y)) |
| 47 | 46 | anim2d 433 |
. . . . . 6
⊢ (x
∈ ℝ → ((∀y ∈
ℕ ¬ x < y ∧ ∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))
→ (∀y ∈ ℕ ¬
x < y ∧ ¬ ∀y ∈ ℕ ¬ x < y))) |
| 48 | 1, 47 | mtoi 94 |
. . . . 5
⊢ (x
∈ ℝ → ¬ (∀y
∈ ℕ ¬ x < y ∧ ∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 49 | | imnan 207 |
. . . . 5
⊢ ((x
∈ ℝ → ¬ (∀y
∈ ℕ ¬ x < y ∧ ∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z)))
↔ ¬ (x ∈ ℝ ∧
(∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z)))) |
| 50 | 48, 49 | mpbi 164 |
. . . 4
⊢ ¬ (x ∈ ℝ ∧ (∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 51 | 50 | nex 779 |
. . 3
⊢ ¬ ∃x(x ∈
ℝ ∧ (∀y ∈ ℕ
¬ x < y ∧ ∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 52 | | df-rex 1206 |
. . 3
⊢ (∃x ∈ ℝ (∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))
↔ ∃x(x ∈ ℝ ∧ (∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z)))) |
| 53 | 51, 52 | mtbir 167 |
. 2
⊢ ¬ ∃x ∈ ℝ (∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z)) |
| 54 | | 1nn 4432 |
. . . . 5
⊢ 1 ∈ ℕ |
| 55 | | n0i 1712 |
. . . . 5
⊢ (1 ∈ ℕ → ¬ ℕ =
∅) |
| 56 | 54, 55 | ax-mp 6 |
. . . 4
⊢ ¬ ℕ = ∅ |
| 57 | | df-ne 1192 |
. . . 4
⊢ (ℕ ≠ ∅ ↔ ¬ ℕ
= ∅) |
| 58 | 56, 57 | mpbir 165 |
. . 3
⊢ ℕ ≠ ∅ |
| 59 | | nnssre 4425 |
. . . 4
⊢ ℕ ⊆ ℝ |
| 60 | | sup2 4510 |
. . . 4
⊢ ((ℕ ⊆ ℝ ∧ ℕ
≠ ∅ ∧ ∃x ∈ ℝ
∀y ∈ ℕ (y < x ∨
y = x))
→ ∃x ∈ ℝ
(∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 61 | 59, 60 | mp3an1 639 |
. . 3
⊢ ((ℕ ≠ ∅ ∧
∃x ∈ ℝ ∀y ∈ ℕ (y < x ∨
y = x))
→ ∃x ∈ ℝ
(∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 62 | 58, 61 | mpan 518 |
. 2
⊢ (∃x ∈ ℝ ∀y ∈ ℕ (y < x ∨
y = x)
→ ∃x ∈ ℝ
(∀y ∈ ℕ ¬ x < y ∧
∀y ∈ ℝ (y < x →
∃z ∈ ℕ y < z))) |
| 63 | 53, 62 | mto 93 |
1
⊢ ¬ ∃x ∈ ℝ ∀y ∈ ℕ (y < x ∨
y = x) |