Theorem hashimarni 13805

Description: If the size of the image of a one-to-one function 𝐸 under the range of a function 𝐹 which is a one-to-one function into the domain of 𝐸 is a nonnegative integer, the size of the function 𝐹 is the same nonnegative integer. (Contributed by Alexander van der Vekens, 4-Feb-2018.)

Assertion

Ref	Expression
hashimarni	⊢ ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → ((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ 𝑃 = (𝐸 “ ran 𝐹) ∧ (♯‘𝑃) = 𝑁) → (♯‘𝐹) = 𝑁))

Proof of Theorem hashimarni

Step	Hyp	Ref	Expression
1		fveqeq2 6681	. . . . . . . 8 ⊢ (𝑃 = (𝐸 “ ran 𝐹) → ((♯‘𝑃) = 𝑁 ↔ (♯‘(𝐸 “ ran 𝐹)) = 𝑁))
2	1	adantl 484	. . . . . . 7 ⊢ (((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) ∧ 𝑃 = (𝐸 “ ran 𝐹)) → ((♯‘𝑃) = 𝑁 ↔ (♯‘(𝐸 “ ran 𝐹)) = 𝑁))
3		hashimarn 13804	. . . . . . . . . . 11 ⊢ ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → (𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 → (♯‘(𝐸 “ ran 𝐹)) = (♯‘𝐹)))
4	3	impcom 410	. . . . . . . . . 10 ⊢ ((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) → (♯‘(𝐸 “ ran 𝐹)) = (♯‘𝐹))
5		id 22	. . . . . . . . . 10 ⊢ ((♯‘(𝐸 “ ran 𝐹)) = 𝑁 → (♯‘(𝐸 “ ran 𝐹)) = 𝑁)
6	4, 5	sylan9req 2879	. . . . . . . . 9 ⊢ (((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) ∧ (♯‘(𝐸 “ ran 𝐹)) = 𝑁) → (♯‘𝐹) = 𝑁)
7	6	ex 415	. . . . . . . 8 ⊢ ((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) → ((♯‘(𝐸 “ ran 𝐹)) = 𝑁 → (♯‘𝐹) = 𝑁))
8	7	adantr 483	. . . . . . 7 ⊢ (((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) ∧ 𝑃 = (𝐸 “ ran 𝐹)) → ((♯‘(𝐸 “ ran 𝐹)) = 𝑁 → (♯‘𝐹) = 𝑁))
9	2, 8	sylbid 242	. . . . . 6 ⊢ (((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ (𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉)) ∧ 𝑃 = (𝐸 “ ran 𝐹)) → ((♯‘𝑃) = 𝑁 → (♯‘𝐹) = 𝑁))
10	9	exp31 422	. . . . 5 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 → ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → (𝑃 = (𝐸 “ ran 𝐹) → ((♯‘𝑃) = 𝑁 → (♯‘𝐹) = 𝑁))))
11	10	com23 86	. . . 4 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 → (𝑃 = (𝐸 “ ran 𝐹) → ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → ((♯‘𝑃) = 𝑁 → (♯‘𝐹) = 𝑁))))
12	11	com34 91	. . 3 ⊢ (𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 → (𝑃 = (𝐸 “ ran 𝐹) → ((♯‘𝑃) = 𝑁 → ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → (♯‘𝐹) = 𝑁))))
13	12	3imp 1107	. 2 ⊢ ((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ 𝑃 = (𝐸 “ ran 𝐹) ∧ (♯‘𝑃) = 𝑁) → ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → (♯‘𝐹) = 𝑁))
14	13	com12 32	1 ⊢ ((𝐸:dom 𝐸–1-1→ran 𝐸 ∧ 𝐸 ∈ 𝑉) → ((𝐹:(0..^(♯‘𝐹))–1-1→dom 𝐸 ∧ 𝑃 = (𝐸 “ ran 𝐹) ∧ (♯‘𝑃) = 𝑁) → (♯‘𝐹) = 𝑁))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1537   ∈ wcel 2114  dom cdm 5557  ran crn 5558   “ cima 5560  –1-1→wf1 6354  ‘cfv 6357  (class class class)co 7158  0cc0 10539  ..^cfzo 13036  ♯chash 13693

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 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463  ax-cnex 10595  ax-resscn 10596  ax-1cn 10597  ax-icn 10598  ax-addcl 10599  ax-addrcl 10600  ax-mulcl 10601  ax-mulrcl 10602  ax-mulcom 10603  ax-addass 10604  ax-mulass 10605  ax-distr 10606  ax-i2m1 10607  ax-1ne0 10608  ax-1rid 10609  ax-rnegex 10610  ax-rrecex 10611  ax-cnre 10612  ax-pre-lttri 10613  ax-pre-lttrn 10614  ax-pre-ltadd 10615  ax-pre-mulgt0 10616

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 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-nel 3126  df-ral 3145  df-rex 3146  df-reu 3147  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-int 4879  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-lim 6198  df-suc 6199  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-riota 7116  df-ov 7161  df-oprab 7162  df-mpo 7163  df-om 7583  df-2nd 7692  df-wrecs 7949  df-recs 8010  df-rdg 8048  df-1o 8104  df-er 8291  df-en 8512  df-dom 8513  df-sdom 8514  df-fin 8515  df-card 9370  df-pnf 10679  df-mnf 10680  df-xr 10681  df-ltxr 10682  df-le 10683  df-sub 10874  df-neg 10875  df-nn 11641  df-n0 11901  df-z 11985  df-uz 12247  df-hash 13694

This theorem is referenced by: (None)