**WHEN THE
INSTRUCTOR SAYS** |
**HE REALLY
MEANS** |

trivial |
The student might be
able to do it in three hours or so. |

simple |
An "A"
student can do it in a week or so. |

easy |
This topic would make
a good master's thesis. |

clear |
The instructor can do
it (he thinks). |

obvious |
The instructor is
sure it is in his notes somewhere. |

certainly |
The instructor saw
one of his instructors do it, but has completely forgotten how it was done. |

Left as an exercise
for the student |
The instructor lost
his notes. |

is well known |
The instructor heard
that someone once did it. |

can be shown |
The instructor thinks
it might be true, but has no idea how to prove it. |

the diligent student
can show |
It is an unsolved
problem - probably harder than Fermat's Last Theorem. |