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Theorem tpos0 8203
Description: Transposition of the empty set. (Contributed by NM, 10-Sep-2015.)
Assertion
Ref Expression
tpos0 tpos ∅ = ∅

Proof of Theorem tpos0
StepHypRef Expression
1 rel0 5749 . . . 4 Rel ∅
2 eqid 2740 . . . . 5 ∅ = ∅
3 fn0 6623 . . . . 5 (∅ Fn ∅ ↔ ∅ = ∅)
42, 3mpbir 232 . . . 4 ∅ Fn ∅
5 tposfn2 8195 . . . 4 (Rel ∅ → (∅ Fn ∅ → tpos ∅ Fn ∅))
61, 4, 5mp2 9 . . 3 tpos ∅ Fn
7 cnv0 6097 . . . 4 ∅ = ∅
87fneq2i 6590 . . 3 (tpos ∅ Fn ∅ ↔ tpos ∅ Fn ∅)
96, 8mpbi 231 . 2 tpos ∅ Fn ∅
10 fn0 6623 . 2 (tpos ∅ Fn ∅ ↔ tpos ∅ = ∅)
119, 10mpbi 231 1 tpos ∅ = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1547  c0 4268  ccnv 5624  Rel wrel 5630   Fn wfn 6487  tpos ctpos 8172
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 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-nul 5235  ax-pow 5301  ax-pr 5369  ax-un 7685
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-nfc 2889  df-ne 2936  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4269  df-if 4462  df-pw 4538  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-opab 5142  df-mpt 5161  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-iota 6448  df-fun 6494  df-fn 6495  df-fv 6500  df-tpos 8173
This theorem is referenced by:  oppchomfval  17678  oppgplusfval  19321  opprmulfval  20317  termolmd  50167
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