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5882270
PROOF
Description
asasi Calculus Mind Map on PROOF, created by Danial Khir on 14/07/2016.
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calculus
asasi
Mind Map by
Danial Khir
, updated more than 1 year ago
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Created by a deleted user almost 8 years ago
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Danial Khir
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Resource summary
PROOF
Methods
Indirect Method
Contrapositive
• Alternative to direct proof called contrapositive proof.
• Used to prove conditional statements of the form “ If P, then Q”
• There are occasions where contrapositive proof is much easier
Steps of the method :
• P ->Q is logically equivalent to ~p->~q
Steps 1: determine p and q
Steps 2:uses the proof by contrapositive outline to prove the statement.
consequently 7 x + 9 = 2y + 1 is odd
Therefore 7 x + 9 is not even
the statement is then proven
Contradiction
• P ->Q is logically equivalent to ~p v q
• ~(P ->Q) is logically equivalent to p^~q
Example 4
STEP 1: write statement in symbol
Step 2 : use proof by contradiction outline to prove the statement
X= 2k
subtittute x= 2k into .
contradiction is proven
proven that
statement is even
the statement is then proven
Direct Method
Conditional Statement
Outline
Example
If x is odd then x^2 is odd
Mathematical Induction
Conditional statement
Outline
Inductive step
Basic step
Example
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