**Description:** First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

Ref | Expression | ||
---|---|---|---|

Hypotheses | bnj1198.1 | $${\u22a2}{\phi}\to \exists {x}\phantom{\rule{.4em}{0ex}}{\psi}$$ | |

bnj1198.2 | No typesetting found for |- ( ps' <-> ps ) with typecode |- | ||

Assertion | bnj1198 | Could not format assertion : No typesetting found for |- ( ph -> E. x ps' ) with typecode |- |

Step | Hyp | Ref | Expression |
---|---|---|---|

1 | bnj1198.1 | $${\u22a2}{\phi}\to \exists {x}\phantom{\rule{.4em}{0ex}}{\psi}$$ | |

2 | bnj1198.2 | Could not format ( ps' <-> ps ) : No typesetting found for |- ( ps' <-> ps ) with typecode |- | |

3 | 2 | exbii | Could not format ( E. x ps' <-> E. x ps ) : No typesetting found for |- ( E. x ps' <-> E. x ps ) with typecode |- |

4 | 1 3 | sylibr | Could not format ( ph -> E. x ps' ) : No typesetting found for |- ( ph -> E. x ps' ) with typecode |- |