Description: Union of the span of the empty set. (Contributed by NM, 14-Mar-2015)
Ref | Expression | ||
---|---|---|---|
Hypotheses | lspsn0.z | ||
lspsn0.n | |||
Assertion | lspuni0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lspsn0.z | ||
2 | lspsn0.n | ||
3 | 1 2 | lsp0 | |
4 | 3 | unieqd | |
5 | 1 | fvexi | |
6 | 5 | unisn | |
7 | 4 6 | eqtrdi |