Date: 09/10/97 at 12:26:48
From: Doctor Rob
Subject: Re: Factors and primes
The Fundamental Theorem of Arithmetic, that every positive integer
can be uniquely factored into a product of powers of prime numbers,
would fail, since 3 = 1*3 = 1^2*3 = 1^3*3 = ... . It would have to be
restated to say that every positive integer can be uniquely factored
into a product of powers of prime numbers different from 1.
Many other theorems would have to be restated to say things about
"prime numbers different than 1." Example: every prime number
(different from 1) has exactly two positive divisors. It is just
simpler to exclude 1 from the set of prime numbers.
Furthermore, 1 is a member of a different class: the units.
They are integers whose reciprocal is also an integer. They consist
of 1 and -1 only. The set of integers (or, more generally, any ring)
is generally split into four sets: the zero-divisors, the units, the
primes, and the composites. These are mutually exclusive and
collectively exhaustive.
-Doctor Rob, The Math Forum
Check out our web site! http://mathforum.org/dr.math/
Date: 09/10/97 at 12:26:48From: Doctor RobSubject: Re: Factors and primesThe Fundamental Theorem of Arithmetic, that every positive integercan be uniquely factored into a product of powers of prime numbers,would fail, since 3 = 1*3 = 1^2*3 = 1^3*3 = ... . It would have to berestated to say that every positive integer can be uniquely factoredinto a product of powers of prime numbers different from 1.Many other theorems would have to be restated to say things about"prime numbers different than 1." Example: every prime number(different from 1) has exactly two positive divisors. It is justsimpler to exclude 1 from the set of prime numbers.Furthermore, 1 is a member of a different class: the units. They are integers whose reciprocal is also an integer. They consist of 1 and -1 only. The set of integers (or, more generally, any ring) is generally split into four sets: the zero-divisors, the units, theprimes, and the composites. These are mutually exclusive andcollectively exhaustive.-Doctor Rob, The Math Forum Check out our web site! http://mathforum.org/dr.math/
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