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Proof Techniques - Stanford University Computer Science

Proof TechniquesJessica SuNovember 12, 20161 Proof techniquesHere we will learn to prove universal mathematical statements, like the square of any oddnumber is odd . It s easy enough to show that this is true in specific cases for example,32= 9, which is an odd number , and 52= 25, which is another odd number . However, toprove the statement, we must show that it works forallodd numbers, which is hard becauseyou can t try every single one of that if we want todisprovea universal statement, we only need to find one counterex-ample.

32 = 9, while disproving the statement would require showing that none of the odd numbers have squares that are odd.) 1.0.1 Proving something is true for all members of a group If we want to prove something is true for all odd numbers (for example, that the square of any odd number is odd), we can pick an arbitrary odd number x, and try to ...

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