Dror Bar-Natan: Classes: 2002-03: Math 157 - Analysis I: (137) Next: Homework Assignment 12a Previous: Solution of Term Exam 2

# Integration

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The setting: bounded on , a partition of , , , , , , . Finally, if we say that  is integrable on '' and set .

Theorem 1. For any two partitions , .

Theorem 2. is integrable iff for every there is a partition such that .

Theorem 3. If is continuous on then is integrable on .

Theorem 4. If then (in particular, the rhs makes sense iff the lhs does).

Theorem 5. If and are integrable on then so is , and .

Theorem 6. If is integrable on and is a constant, then is integrable on and .

Theorem . If on and both are integrable on , then .

Theorem 7. If on and is integrable on then .

Theorem 8. If is integrable on and is defined on by , then is continuous on .

This class' fundamental existential dilemma / schizophrenia:

• We want to develop a mathematical world view in which everything is intuitive.
• At the same time, we want to prove everything with no appeal whatsoever to the bad word intuition''.

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Dror Bar-Natan 2003-01-06