Theorem addcanpr 10468

Description: Addition cancellation law for positive reals. Proposition 9-3.5(vi) of [Gleason] p. 123. (Contributed by NM, 9-Apr-1996.) (New usage is discouraged.)

Assertion

Ref	Expression
addcanpr	⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → 𝐵 = 𝐶))

Proof of Theorem addcanpr

Step	Hyp	Ref	Expression
1		addclpr 10440	. . . 4 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴 +P 𝐵) ∈ P)
2		eleq1 2900	. . . . 5 ⊢ ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → ((𝐴 +P 𝐵) ∈ P ↔ (𝐴 +P 𝐶) ∈ P))
3		dmplp 10434	. . . . . 6 ⊢ dom +P = (P × P)
4		0npr 10414	. . . . . 6 ⊢ ¬ ∅ ∈ P
5	3, 4	ndmovrcl 7334	. . . . 5 ⊢ ((𝐴 +P 𝐶) ∈ P → (𝐴 ∈ P ∧ 𝐶 ∈ P))
6	2, 5	syl6bi 255	. . . 4 ⊢ ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → ((𝐴 +P 𝐵) ∈ P → (𝐴 ∈ P ∧ 𝐶 ∈ P)))
7	1, 6	syl5com 31	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → (𝐴 ∈ P ∧ 𝐶 ∈ P)))
8		ltapr 10467	. . . . . . . 8 ⊢ (𝐴 ∈ P → (𝐵<P 𝐶 ↔ (𝐴 +P 𝐵)<P (𝐴 +P 𝐶)))
9		ltapr 10467	. . . . . . . 8 ⊢ (𝐴 ∈ P → (𝐶<P 𝐵 ↔ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵)))
10	8, 9	orbi12d 915	. . . . . . 7 ⊢ (𝐴 ∈ P → ((𝐵<P 𝐶 ∨ 𝐶<P 𝐵) ↔ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
11	10	notbid 320	. . . . . 6 ⊢ (𝐴 ∈ P → (¬ (𝐵<P 𝐶 ∨ 𝐶<P 𝐵) ↔ ¬ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
12	11	ad2antrr 724	. . . . 5 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ (𝐴 ∈ P ∧ 𝐶 ∈ P)) → (¬ (𝐵<P 𝐶 ∨ 𝐶<P 𝐵) ↔ ¬ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
13		ltsopr 10454	. . . . . . 7 ⊢ <P Or P
14		sotrieq 5502	. . . . . . 7 ⊢ ((<P Or P ∧ (𝐵 ∈ P ∧ 𝐶 ∈ P)) → (𝐵 = 𝐶 ↔ ¬ (𝐵<P 𝐶 ∨ 𝐶<P 𝐵)))
15	13, 14	mpan 688	. . . . . 6 ⊢ ((𝐵 ∈ P ∧ 𝐶 ∈ P) → (𝐵 = 𝐶 ↔ ¬ (𝐵<P 𝐶 ∨ 𝐶<P 𝐵)))
16	15	ad2ant2l 744	. . . . 5 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ (𝐴 ∈ P ∧ 𝐶 ∈ P)) → (𝐵 = 𝐶 ↔ ¬ (𝐵<P 𝐶 ∨ 𝐶<P 𝐵)))
17		addclpr 10440	. . . . . 6 ⊢ ((𝐴 ∈ P ∧ 𝐶 ∈ P) → (𝐴 +P 𝐶) ∈ P)
18		sotrieq 5502	. . . . . . 7 ⊢ ((<P Or P ∧ ((𝐴 +P 𝐵) ∈ P ∧ (𝐴 +P 𝐶) ∈ P)) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) ↔ ¬ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
19	13, 18	mpan 688	. . . . . 6 ⊢ (((𝐴 +P 𝐵) ∈ P ∧ (𝐴 +P 𝐶) ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) ↔ ¬ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
20	1, 17, 19	syl2an 597	. . . . 5 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ (𝐴 ∈ P ∧ 𝐶 ∈ P)) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) ↔ ¬ ((𝐴 +P 𝐵)<P (𝐴 +P 𝐶) ∨ (𝐴 +P 𝐶)<P (𝐴 +P 𝐵))))
21	12, 16, 20	3bitr4d 313	. . . 4 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ (𝐴 ∈ P ∧ 𝐶 ∈ P)) → (𝐵 = 𝐶 ↔ (𝐴 +P 𝐵) = (𝐴 +P 𝐶)))
22	21	exbiri 809	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → ((𝐴 ∈ P ∧ 𝐶 ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → 𝐵 = 𝐶)))
23	7, 22	syld 47	. 2 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → 𝐵 = 𝐶)))
24	23	pm2.43d 53	1 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → ((𝐴 +P 𝐵) = (𝐴 +P 𝐶) → 𝐵 = 𝐶))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   = wceq 1537   ∈ wcel 2114   class class class wbr 5066   Or wor 5473  (class class class)co 7156  Pcnp 10281   +_P cpp 10283  <_P cltp 10285

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-inf2 9104

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-int 4877  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-1st 7689  df-2nd 7690  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-1o 8102  df-oadd 8106  df-omul 8107  df-er 8289  df-ni 10294  df-pli 10295  df-mi 10296  df-lti 10297  df-plpq 10330  df-mpq 10331  df-ltpq 10332  df-enq 10333  df-nq 10334  df-erq 10335  df-plq 10336  df-mq 10337  df-1nq 10338  df-rq 10339  df-ltnq 10340  df-np 10403  df-plp 10405  df-ltp 10407

This theorem is referenced by:  enrer  10485  mulcmpblnr  10493  mulgt0sr  10527