Description: The singletonization is included in the tagging. (Contributed by BJ, 6-Oct-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-sngltagi | ⊢ ( 𝐴 ∈ sngl 𝐵 → 𝐴 ∈ tag 𝐵 ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-snglsstag | ⊢ sngl 𝐵 ⊆ tag 𝐵 | |
2 | 1 | sseli | ⊢ ( 𝐴 ∈ sngl 𝐵 → 𝐴 ∈ tag 𝐵 ) |