Description: A subring is a non-unital ring. (Contributed by AV, 14-Feb-2025)
Ref | Expression | ||
---|---|---|---|
Hypothesis | subrngrng.1 | ||
Assertion | subrngrng |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | subrngrng.1 | ||
2 | simp2 | ||
3 | eqid | ||
4 | 3 | issubrng | |
5 | 1 | eleq1i | |
6 | 2 4 5 | 3imtr4i |