Theorem grpcld 18639

Description: Closure of the operation of a group. (Contributed by SN, 29-Jul-2024.)

Hypotheses

Ref	Expression
grpcld.b	⊢ 𝐵 = (Base‘𝐺)
grpcld.p	⊢ + = (+g‘𝐺)
grpcld.r	⊢ (𝜑 → 𝐺 ∈ Grp)
grpcld.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
grpcld.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)

Assertion

Ref	Expression
grpcld	⊢ (𝜑 → (𝑋 + 𝑌) ∈ 𝐵)

Proof of Theorem grpcld

Step	Hyp	Ref	Expression
1		grpcld.r	. 2 ⊢ (𝜑 → 𝐺 ∈ Grp)
2		grpcld.x	. 2 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
3		grpcld.y	. 2 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
4		grpcld.b	. . 3 ⊢ 𝐵 = (Base‘𝐺)
5		grpcld.p	. . 3 ⊢ + = (+g‘𝐺)
6	4, 5	grpcl 18634	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + 𝑌) ∈ 𝐵)
7	1, 2, 3, 6	syl3anc 1371	1 ⊢ (𝜑 → (𝑋 + 𝑌) ∈ 𝐵)

Syntax hints:   → wi 4   = wceq 1539   ∈ wcel 2104  ‘cfv 6458  (class class class)co 7307  Basecbs 16961  +_gcplusg 17011  Grpcgrp 18626

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1911  ax-6 1969  ax-7 2009  ax-8 2106  ax-9 2114  ax-ext 2707  ax-nul 5239

This theorem depends on definitions:  df-bi 206  df-an 398  df-or 846  df-3an 1089  df-tru 1542  df-fal 1552  df-ex 1780  df-sb 2066  df-clab 2714  df-cleq 2728  df-clel 2814  df-ne 2942  df-ral 3063  df-rex 3072  df-rab 3306  df-v 3439  df-sbc 3722  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-nul 4263  df-if 4466  df-sn 4566  df-pr 4568  df-op 4572  df-uni 4845  df-br 5082  df-iota 6410  df-fv 6466  df-ov 7310  df-mgm 18375  df-sgrp 18424  df-mnd 18435  df-grp 18629

This theorem is referenced by:  dfgrp3  18723  cphpyth  24429