Theorem bj-mndsssmgrp 37947

Description: Monoids are semigroups. (Contributed by BJ, 11-Apr-2024.) (Proof modification is discouraged.)

Assertion

Ref	Expression
bj-mndsssmgrp	⊢ Mnd ⊆ Smgrp

Proof of Theorem bj-mndsssmgrp

Dummy variables 𝑔 𝑏 𝑝 𝑒 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-mnd 18818	. 2 ⊢ Mnd = {𝑔 ∈ Smgrp ∣ [(Base‘𝑔) / 𝑏][(+g‘𝑔) / 𝑝]∃𝑒 ∈ 𝑏 ∀𝑥 ∈ 𝑏 ((𝑒𝑝𝑥) = 𝑥 ∧ (𝑥𝑝𝑒) = 𝑥)}
2	1	ssrab3 4039	1 ⊢ Mnd ⊆ Smgrp

This proof depends on syntax axioms:   ∧ wa 401   = wceq 1570  ∀wral 3082  ∃wrex 3092  [wsbc 3747   ⊆ wss 3908  ‘cfv 6543  (class class class)co 7423  Basecbs 17294  +_gcplusg 17335  Smgrpcsgrp 18801  Mndcmnd 18817

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2738

This proof depends on definitions:  df-bi 210  df-an 402  df-ex 1813  df-sb 2100  df-clab 2745  df-cleq 2758  df-clel 2841  df-rab 3420  df-ss 3925  df-mnd 18818

This theorem is used by:  bj-mndsssmgrpel  37948