 Solution

ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2019/discrete-mathematics-continuous-mathematics-and-probability/3/a/i/solution

A

σ : A \to A

with no fixed point:

σ (a) \neq = a

for every

a \in A

. Thus every element is moved, although the permutation remains a bijection.

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