Press the right key for the next slide (or swipe left)

also ...

Press the left key to go backwards (or swipe right)

Press n to toggle whether notes are shown (no equivalent if you don't have a keyboard)

Press m or double tap to see a menu of slides

If she has seen it, I am dead.

A → B

That's not true.

¬(A → B)

If she has seen it, I am not dead.

A → ¬B

A | B | A → B | ¬(A → B) | A → ¬B |

T | T | T | F | F |

T | F | F | T | T |

F | T | T | F | T |

F | F | T | F | T |

Only the first negated sentence guarantees that I am alive. Once again, where negation goes is a matter of life and death.