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Theorem 1t1e1ALT 42250
Description: Alternate proof of 1t1e1 12455 using a different set of axioms (add ax-mulrcl 11247, ax-i2m1 11252, ax-1ne0 11253, ax-rrecex 11256 and remove ax-resscn 11241, ax-mulcom 11248, ax-mulass 11250, ax-distr 11251). (Contributed by Steven Nguyen, 20-Sep-2022.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
1t1e1ALT (1 · 1) = 1

Proof of Theorem 1t1e1ALT
StepHypRef Expression
1 1re 11290 . 2 1 ∈ ℝ
2 ax-1rid 11254 . 2 (1 ∈ ℝ → (1 · 1) = 1)
31, 2ax-mp 5 1 (1 · 1) = 1
Colors of variables: wff setvar class
Syntax hints:   = wceq 1537  wcel 2108  (class class class)co 7448  cr 11183  1c1 11185   · cmul 11189
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2711  ax-1cn 11242  ax-icn 11243  ax-addcl 11244  ax-mulcl 11246  ax-mulrcl 11247  ax-i2m1 11252  ax-1ne0 11253  ax-1rid 11254  ax-rrecex 11256  ax-cnre 11257
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-iota 6525  df-fv 6581  df-ov 7451
This theorem is referenced by:  nnmul1com  42260  remulinvcom  42408  sn-0tie0  42415
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