Theorem.
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| Hyp | Ref | Line | Expr |
| eqt> | 1 | ((![]() ![]() ) ((![]() ![]() ) (![]() ![]() ))) | |
| 1 | bi.bldim>d | 2 | ((![]() ![]() ) ((![]() (![]() ![]() )) (![]() (![]() ![]() )))) |
| 2 | bi.bldald | 3 | ((![]() ![]() ) (![]() (![]() (![]() ![]() ))![]() ![]() (![]() (![]() ![]() )))) |
| ax17-bv | 4 | ( bound in ![]() (![]() (![]() ![]() ))) | |
| 3, 4 | sb-xplw | 5 | (![]() (![]() (![]() ![]() )) [ / ]![]() (![]() (![]() ![]() ))) |
| 5 | sb-spec-ex | 6 | (![]() (![]() (![]() ![]() ))![]() ![]() ![]() ![]() (![]() (![]() ![]() ))) |
| df-∃mo-alt2 | 7 | (![]() ![]() ![]() (![]() (![]() ![]() ))![]() ![]() ![]() ) | |
| 6, 7 | syl | 8 | (![]() (![]() (![]() ![]() ))![]() ![]() ![]() ) |