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Unformatted text preview: MATH 55 Prof. Bernoff Fall 2007 Harvey Mudd College Homework 1 Solutions 1.1 Simplify the following algebraic expression: ( x a )( x b )( x c )( x z ) . Solution Hint: Consider the twentyfourth factor. 9.1 Write out the following sets by listing their elements between curly braces. (a) { x N : x 10 and 3  x } . Solution: These are the nonnegative multiples of 3 that are also less than 10: { , 3 , 6 , 9 } . (b) { x Z : x is prime, and 2  x } . Solution: The prime multiples of 2 are somewhat sparse: { 2 } . (c) { x Z : x 2 = 4 } . Solution: The solutions to the equation x 2 = 4 are 2: { 2 , 2 } . (d) { x Z : x 2 = 5 } . Solution: There are no integers that square to 5: . (e) 2 . Solution: The only subset of the empty set is the empty set itself: {} notice that this is not the same as the empty set . (f) { x Z : 10  x and x  100 } ....
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 Fall '07
 Bernoff
 Algebra, Sets

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