Description: Equality implies inclusion, deduction version. (Contributed by SN, 15-Feb-2025)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | eqimssd.1 | ⊢ ( 𝜑 → 𝐴 = 𝐵 ) | |
| Assertion | eqimsscd | ⊢ ( 𝜑 → 𝐵 ⊆ 𝐴 ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqimssd.1 | ⊢ ( 𝜑 → 𝐴 = 𝐵 ) | |
| 2 | ssid | ⊢ 𝐴 ⊆ 𝐴 | |
| 3 | 1 2 | eqsstrrdi | ⊢ ( 𝜑 → 𝐵 ⊆ 𝐴 ) |