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Theorem 1t1e1ALT 42629
Description: Alternate proof of 1t1e1 12314 using a different set of axioms (add ax-mulrcl 11101, ax-i2m1 11106, ax-1ne0 11107, ax-rrecex 11110 and remove ax-resscn 11095, ax-mulcom 11102, ax-mulass 11104, ax-distr 11105). (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 11144 . 2 1 ∈ ℝ
2 ax-1rid 11108 . 2 (1 ∈ ℝ → (1 · 1) = 1)
31, 2ax-mp 5 1 (1 · 1) = 1
Colors of variables: wff setvar class
Syntax hints:   = wceq 1542  wcel 2114  (class class class)co 7368  cr 11037  1c1 11039   · cmul 11043
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-ext 2709  ax-1cn 11096  ax-icn 11097  ax-addcl 11098  ax-mulcl 11100  ax-mulrcl 11101  ax-i2m1 11106  ax-1ne0 11107  ax-1rid 11108  ax-rrecex 11110  ax-cnre 11111
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-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-iota 6456  df-fv 6508  df-ov 7371
This theorem is referenced by:  nnmul1com  42645  remulinvcom  42807  sn-0tie0  42825
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