Theorem nnmcan 8450

Description: Cancellation law for multiplication of natural numbers. (Contributed by NM, 26-Oct-1995.) (Revised by Mario Carneiro, 15-Nov-2014.)

Assertion

Ref	Expression
nnmcan	⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → ((𝐴 ·o 𝐵) = (𝐴 ·o 𝐶) ↔ 𝐵 = 𝐶))

Proof of Theorem nnmcan

Step	Hyp	Ref	Expression
1		3anrot 1099	. . . . 5 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ↔ (𝐵 ∈ ω ∧ 𝐶 ∈ ω ∧ 𝐴 ∈ ω))
2		nnmword 8449	. . . . 5 ⊢ (((𝐵 ∈ ω ∧ 𝐶 ∈ ω ∧ 𝐴 ∈ ω) ∧ ∅ ∈ 𝐴) → (𝐵 ⊆ 𝐶 ↔ (𝐴 ·o 𝐵) ⊆ (𝐴 ·o 𝐶)))
3	1, 2	sylanb 581	. . . 4 ⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → (𝐵 ⊆ 𝐶 ↔ (𝐴 ·o 𝐵) ⊆ (𝐴 ·o 𝐶)))
4		3anrev 1100	. . . . 5 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ↔ (𝐶 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐴 ∈ ω))
5		nnmword 8449	. . . . 5 ⊢ (((𝐶 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐴 ∈ ω) ∧ ∅ ∈ 𝐴) → (𝐶 ⊆ 𝐵 ↔ (𝐴 ·o 𝐶) ⊆ (𝐴 ·o 𝐵)))
6	4, 5	sylanb 581	. . . 4 ⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → (𝐶 ⊆ 𝐵 ↔ (𝐴 ·o 𝐶) ⊆ (𝐴 ·o 𝐵)))
7	3, 6	anbi12d 631	. . 3 ⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → ((𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ 𝐵) ↔ ((𝐴 ·o 𝐵) ⊆ (𝐴 ·o 𝐶) ∧ (𝐴 ·o 𝐶) ⊆ (𝐴 ·o 𝐵))))
8	7	bicomd 222	. 2 ⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → (((𝐴 ·o 𝐵) ⊆ (𝐴 ·o 𝐶) ∧ (𝐴 ·o 𝐶) ⊆ (𝐴 ·o 𝐵)) ↔ (𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ 𝐵)))
9		eqss 3941	. 2 ⊢ ((𝐴 ·o 𝐵) = (𝐴 ·o 𝐶) ↔ ((𝐴 ·o 𝐵) ⊆ (𝐴 ·o 𝐶) ∧ (𝐴 ·o 𝐶) ⊆ (𝐴 ·o 𝐵)))
10		eqss 3941	. 2 ⊢ (𝐵 = 𝐶 ↔ (𝐵 ⊆ 𝐶 ∧ 𝐶 ⊆ 𝐵))
11	8, 9, 10	3bitr4g 314	1 ⊢ (((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) ∧ ∅ ∈ 𝐴) → ((𝐴 ·o 𝐵) = (𝐴 ·o 𝐶) ↔ 𝐵 = 𝐶))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   ∧ w3a 1086   = wceq 1542   ∈ wcel 2110   ⊆ wss 3892  ∅c0 4262  (class class class)co 7271  ωcom 7706   ·_o comu 8286

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-sep 5227  ax-nul 5234  ax-pr 5356  ax-un 7582

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ne 2946  df-ral 3071  df-rex 3072  df-reu 3073  df-rab 3075  df-v 3433  df-sbc 3721  df-csb 3838  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-pss 3911  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-iun 4932  df-br 5080  df-opab 5142  df-mpt 5163  df-tr 5197  df-id 5490  df-eprel 5496  df-po 5504  df-so 5505  df-fr 5545  df-we 5547  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-pred 6201  df-ord 6268  df-on 6269  df-lim 6270  df-suc 6271  df-iota 6390  df-fun 6434  df-fn 6435  df-f 6436  df-f1 6437  df-fo 6438  df-f1o 6439  df-fv 6440  df-ov 7274  df-oprab 7275  df-mpo 7276  df-om 7707  df-2nd 7825  df-frecs 8088  df-wrecs 8119  df-recs 8193  df-rdg 8232  df-oadd 8292  df-omul 8293

This theorem is referenced by:  mulcanpi  10657