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Theorem 1t1e1ALT 39175
Description: Alternate proof of 1t1e1 11800 using a different set of axioms (add ax-mulrcl 10600, ax-i2m1 10605, ax-1ne0 10606, ax-rrecex 10609 and remove ax-resscn 10594, ax-mulcom 10601, ax-mulass 10603, ax-distr 10604). (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 10641 . 2 1 ∈ ℝ
2 ax-1rid 10607 . 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 2114  (class class class)co 7156  cr 10536  1c1 10538   · cmul 10542
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 2793  ax-1cn 10595  ax-icn 10596  ax-addcl 10597  ax-mulcl 10599  ax-mulrcl 10600  ax-i2m1 10605  ax-1ne0 10606  ax-1rid 10607  ax-rrecex 10609  ax-cnre 10610
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-iota 6314  df-fv 6363  df-ov 7159
This theorem is referenced by:  nnmul1com  39184  remulinvcom  39268
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