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Mathematical induction & Recursion

1M. HauskrechtCS 441 Discrete mathematics for CSCS 441 Discrete Mathematics for CSLecture 15 Milos Sennott SquareMathematical induction & RecursionM. HauskrechtCS 441 Discrete mathematics for CSProofsBasic proof methods: Direct, Indirect, Contradiction, By Cases, EquivalencesProof of quantified statements: There exists x with some property P(x). It is sufficient to find one element for which the property holds. For all x some property P(x) holds. Proofs of For all x some property P(x) holds must cover all x and can be harder. Mathematical inductionis a technique that can be applied to prove the universal statements for sets of positive integers or their associated sequences. 2M. HauskrechtCS 441 Discrete mathematics for CSMathematical induction Used to prove statements of the form x P(x) where x Z+ Mathematical induction proofs consists of two steps:1) Basis:The proposition P(1) is ) Inductive Step:The implication P(n) P(n+1), is true for all positive n.

Mathematical induction • Used to prove statements of the form x P(x) where x Z+ Mathematical induction proofs consists of two steps: 1) Basis: The proposition P(1) is true. 2) Inductive Step: The implication P(n) P(n+1), is true for all positive n. • Therefore we conclude x P(x).

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