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Carl Horowitz
Carl Horowitz
University of Michigan
Runs his own tutoring company
Carl taught upperlevel math in several schools and currently runs his own tutoring company. He bets that no one can beat his love for intensive outdoor activities!
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Concept (1)
Sample Problems (3)
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Introduction to Functions
Problem 1 9,512 viewsDefinition of a function.

Introduction to Functions
Problem 2 6,303 viewsWhich one are functions?
F = {(1,2),(2,4),(3,7)}G = {(1,2),(2,4),(3,7),(2,4)}H = {(1,2),(2,4),(3,7),(2,4),(1,3)} 
Introduction to Functions
Problem 3 5,954 viewsVertical Line Test for functions
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