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Theorem tpos0 8199
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 5748 . . . 4 Rel ∅
2 eqid 2737 . . . . 5 ∅ = ∅
3 fn0 6623 . . . . 5 (∅ Fn ∅ ↔ ∅ = ∅)
42, 3mpbir 231 . . . 4 ∅ Fn ∅
5 tposfn2 8191 . . . 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 230 . 2 tpos ∅ Fn ∅
10 fn0 6623 . 2 (tpos ∅ Fn ∅ ↔ tpos ∅ = ∅)
119, 10mpbi 230 1 tpos ∅ = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  c0 4274  ccnv 5623  Rel wrel 5629   Fn wfn 6487  tpos ctpos 8168
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-nul 5241  ax-pow 5302  ax-pr 5370  ax-un 7682
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-iota 6448  df-fun 6494  df-fn 6495  df-fv 6500  df-tpos 8169
This theorem is referenced by:  oppchomfval  17671  oppgplusfval  19314  opprmulfval  20310  termolmd  50157
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