MATH 1P70 Lecture Notes - Lecture 5: Pomegranate, Straight Edge, Set Notation
Document Summary
Rational numbers - (with only one line going through it) All decimal numbers - notation: , { } (all numbers have a place on the number line) A special set: definition: the set that has no elements is called the empty set. |a| = unknown if finite is infinite e. g. a = set of all mersenne primes. Given any angle, using a compass and straight edge, can you somehow divide the angle into three equal angles? e. g. subsets. Want to define what it means for one set to sit inside another. definition: we say a set a is a subset of a set of b provided every element of a is also an element.