Is there a natural number between 0 and 1? A proof, s'il vous plaît, not your personal opinion. (Assume the Peano Postulates.)

miniliv4

miniliv4

Answered question

2022-09-04

Is there a natural number between 0 and 1?
A proof, s'il vous plaît, not your personal opinion. (Assume the Peano Postulates.)

Answer & Explanation

graulhavav9

graulhavav9

Beginner2022-09-05Added 14 answers

Every natural number m is either 0 or s ( n ), where n is a natural number.

Proof: It can't be both, because s ( n ) can't be 0. Set of all natural numbers which are either 0 or s ( n ) for some n satisfies induction principle, so it contains all natural numbers.

Direct consequence: Every natural number is either 0, or s ( 0 ) or s ( s ( n ) ) for some natural number n.

Suppose there is m such that 0 < m < s ( 0 ). Either m is 0, s ( 0 ) or s ( s ( n ) ). First two cannot hold, so you have s ( s ( n ) ) < s ( 0 ), i.e., s ( n ) < 0.
s2vunov

s2vunov

Beginner2022-09-06Added 2 answers

HINT
    S n   =   S 0     n = 0 S m

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