Consider the following statement. For every integer n, if n > 2 then there is a prime number p such that n < p < n!. The statement is true, but the following proposed proof is incorrect. Proposed proof: Let n be any integer that is greater than 2. By the infinitude of the primes theorem (Theorem 4.8.4), there is a prime number p such that n < p. Since n > 2, n! − 1 is an integer that is greater than 1. So by the divisibility by a prime theorem (Theorem 4.4.4), there is a prime number p such that p | (n! − 1). Thus, p ≤ n! − 1, and so p < n!. Therefore, by steps 2 and 5, there is a prime number p such that n < p < n!. Identify the error(s) in the proposed proof. (Select all that apply.) p | (n! − 1) does not imply that p is less than or equal to n! − 1.The statement can only be proved by contradiction.The divisibility by a prime theorem is incorrectly applied in step 4.The p in step 2 may not be the same as the p in step 5.The proof does not work if n is prime.The proof does not work if n! − 1 is prime.The infinitude of the primes theorem is incorrectly applied in step 2.
Consider the following statement. For every integer n, if n > 2 then there is a prime number p such that n < p < n!. The statement is true, but the following proposed proof is incorrect. Proposed proof: Let n be any integer that is greater than 2. By the infinitude of the primes theorem (Theorem 4.8.4), there is a prime number p such that n < p. Since n > 2, n! − 1 is an integer that is greater than 1. So by the divisibility by a prime theorem (Theorem 4.4.4), there is a prime number p such that p | (n! − 1). Thus, p ≤ n! − 1, and so p < n!. Therefore, by steps 2 and 5, there is a prime number p such that n < p < n!. Identify the error(s) in the proposed proof. (Select all that apply.) p | (n! − 1) does not imply that p is less than or equal to n! − 1.The statement can only be proved by contradiction.The divisibility by a prime theorem is incorrectly applied in step 4.The p in step 2 may not be the same as the p in step 5.The proof does not work if n is prime.The proof does not work if n! − 1 is prime.The infinitude of the primes theorem is incorrectly applied in step 2.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
Consider the following statement.
For every integer n, if
n > 2
then there is a prime number p such that
n < p < n!.
The statement is true, but the following proposed proof is incorrect.
Proposed proof:
- Let n be any integer that is greater than 2.
- By the infinitude of the primes theorem (Theorem 4.8.4), there is a prime number p such that
n < p.
- Since
n > 2, n! − 1is an integer that is greater than 1.
- So by the divisibility by a prime theorem (Theorem 4.4.4), there is a prime number p such that
p | (n! − 1).
- Thus,
p ≤ n! − 1,and sop < n!.
- Therefore, by steps 2 and 5, there is a prime number p such that
n < p < n!.
Identify the error(s) in the proposed proof. (Select all that apply.)
p | (n! − 1) does not imply that p is less than or equal to n! − 1.The statement can only be proved by contradiction.The divisibility by a prime theorem is incorrectly applied in step 4.The p in step 2 may not be the same as the p in step 5.The proof does not work if n is prime.The proof does not work if n! − 1 is prime.The infinitude of the primes theorem is incorrectly applied in step 2.
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