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Theorem mndpfo 17242
 Description: The addition operation of a monoid as a function is an onto function. (Contributed by FL, 2-Nov-2009.) (Revised by Mario Carneiro, 11-Oct-2013.) (Revised by AV, 23-Jan-2020.)
Hypotheses
Ref Expression
mndpf.b 𝐵 = (Base‘𝐺)
mndpf.p = (+𝑓𝐺)
Assertion
Ref Expression
mndpfo (𝐺 ∈ Mnd → :(𝐵 × 𝐵)–onto𝐵)

Proof of Theorem mndpfo
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mndpf.b . . 3 𝐵 = (Base‘𝐺)
2 mndpf.p . . 3 = (+𝑓𝐺)
31, 2mndplusf 17237 . 2 (𝐺 ∈ Mnd → :(𝐵 × 𝐵)⟶𝐵)
4 simpr 477 . . . . 5 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → 𝑥𝐵)
5 eqid 2621 . . . . . . 7 (0g𝐺) = (0g𝐺)
61, 5mndidcl 17236 . . . . . 6 (𝐺 ∈ Mnd → (0g𝐺) ∈ 𝐵)
76adantr 481 . . . . 5 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → (0g𝐺) ∈ 𝐵)
8 eqid 2621 . . . . . . 7 (+g𝐺) = (+g𝐺)
91, 8, 5mndrid 17240 . . . . . 6 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → (𝑥(+g𝐺)(0g𝐺)) = 𝑥)
109eqcomd 2627 . . . . 5 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → 𝑥 = (𝑥(+g𝐺)(0g𝐺)))
11 rspceov 6652 . . . . 5 ((𝑥𝐵 ∧ (0g𝐺) ∈ 𝐵𝑥 = (𝑥(+g𝐺)(0g𝐺))) → ∃𝑦𝐵𝑧𝐵 𝑥 = (𝑦(+g𝐺)𝑧))
124, 7, 10, 11syl3anc 1323 . . . 4 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → ∃𝑦𝐵𝑧𝐵 𝑥 = (𝑦(+g𝐺)𝑧))
131, 8, 2plusfval 17176 . . . . . 6 ((𝑦𝐵𝑧𝐵) → (𝑦 𝑧) = (𝑦(+g𝐺)𝑧))
1413eqeq2d 2631 . . . . 5 ((𝑦𝐵𝑧𝐵) → (𝑥 = (𝑦 𝑧) ↔ 𝑥 = (𝑦(+g𝐺)𝑧)))
15142rexbiia 3049 . . . 4 (∃𝑦𝐵𝑧𝐵 𝑥 = (𝑦 𝑧) ↔ ∃𝑦𝐵𝑧𝐵 𝑥 = (𝑦(+g𝐺)𝑧))
1612, 15sylibr 224 . . 3 ((𝐺 ∈ Mnd ∧ 𝑥𝐵) → ∃𝑦𝐵𝑧𝐵 𝑥 = (𝑦 𝑧))
1716ralrimiva 2961 . 2 (𝐺 ∈ Mnd → ∀𝑥𝐵𝑦𝐵𝑧𝐵 𝑥 = (𝑦 𝑧))
18 foov 6768 . 2 ( :(𝐵 × 𝐵)–onto𝐵 ↔ ( :(𝐵 × 𝐵)⟶𝐵 ∧ ∀𝑥𝐵𝑦𝐵𝑧𝐵 𝑥 = (𝑦 𝑧)))
193, 17, 18sylanbrc 697 1 (𝐺 ∈ Mnd → :(𝐵 × 𝐵)–onto𝐵)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 384   = wceq 1480   ∈ wcel 1987  ∀wral 2907  ∃wrex 2908   × cxp 5077  ⟶wf 5848  –onto→wfo 5850  ‘cfv 5852  (class class class)co 6610  Basecbs 15788  +gcplusg 15869  0gc0g 16028  +𝑓cplusf 17167  Mndcmnd 17222 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-fo 5858  df-fv 5860  df-riota 6571  df-ov 6613  df-oprab 6614  df-mpt2 6615  df-1st 7120  df-2nd 7121  df-0g 16030  df-plusf 17169  df-mgm 17170  df-sgrp 17212  df-mnd 17223 This theorem is referenced by:  mndfo  17243  grpplusfo  17363
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