Description: Monoids are semigroups (elemental version). (Contributed by BJ, 11-Apr-2024) (Proof modification is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | bj-mndsssmgrpel | ⊢ ( 𝐺 ∈ Mnd → 𝐺 ∈ Smgrp ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bj-mndsssmgrp | ⊢ Mnd ⊆ Smgrp | |
| 2 | 1 | sseli | ⊢ ( 𝐺 ∈ Mnd → 𝐺 ∈ Smgrp ) |