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### 23 Cards in this Set

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 Neither surjective nor injective What kind of mapping is this? Bijection What kind of mapping is this? Bijection What kind of mapping is this? Injection or one-to-one What kind of mapping is this? Injection or one-to-one What kind of mapping is this? Neither injection nor surjection What kind of mapping is this? Surjection or onto What kind of mapping is this? Surjection or onto What kind of mapping is this? Another name for surjection onto Another name for onto surjection Another name for injective one-to-one Another name for one-to-one Injective How many fixed points does a rotation have? One How many fixed points does a translation have? None How many fixed points does a glide have? None How many fixed points does a reflection have? An infinite number of fixed points (those on the line we are reflecting over). Which isometries preserve orientation? Rotation and translation Which isometries reverse orientation? Glide and reflection. Equilateral Isosceles, scalene or equilateral? Isoceles Isosceles, scalene or equilateral? Scalene Isosceles, scalene or equilateral? Define surjection For every y in the codomain Y there is at least one x in the domain X with f(x) = y. Surge covers all - every y has an x Define injection For every y in the codomain Y, there is at most one x in the domain X with f(x) = y. Two don't map to one - can't inject the same piece of skin with two needles at the same time.