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#1 2008-09-08 17:04:58

teineg
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Registered: 2008-09-08
Posts: 0

My daughter need some help with this

Why is a set of factor of a number not the same as the set of proper factor of that number

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#2 2008-09-08 22:26:30

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

Re: My daughter need some help with this

A proper factor of a number is not allowed to be 1 or the number itself, but a factor can be.

For example, the factors of 6 are 1, 2, 3, 6, but its proper factors are only 2 and 3.


Why did the vector cross the road?
It wanted to be normal.

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#3 2008-09-08 23:19:42

MathsIsFun
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Registered: 2005-01-21
Posts: 7,664

Re: My daughter need some help with this

But rather strangely there is disagreement on whether 1 should be included or not.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#4 2017-06-02 18:20:08

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 933

Re: My daughter need some help with this

MathsIsFun wrote:

But rather strangely there is disagreement on whether 1 should be included or not.

Like the disagreement on whether 0 should be integer or not?

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#5 2017-06-03 04:10:25

greg1313
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Registered: 2016-12-19
Posts: 17

Re: My daughter need some help with this

Monox D. I-Fly wrote:
MathsIsFun wrote:

But rather strangely there is disagreement on whether 1 should be included or not.

Like the disagreement on whether 0 should be integer or not?

There's no disagreement I know of about whether 0 should be an integer or not.

There's inconsistency of whether 0 is a called a counting number or not.

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#6 2017-06-04 20:16:46

Monox D. I-Fly
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Registered: 2015-12-02
Posts: 933

Re: My daughter need some help with this

As far as I know:
Natural numbers = 1, 2, 3, and so on.
Integers = 0, 1, 2, 3, and so on.
But many people disagree.

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#7 2017-06-04 23:48:28

zetafunc
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Registered: 2014-05-21
Posts: 2,130
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Re: My daughter need some help with this

The natural numbers, denoted by
, are usually given as the infinite set
. Some authors take it to include the number
, and to mark this distinction, they often write this as
or the more explicit
. Authors usually make it clear what they want to mean by 'natural number'. However, I have never come across any ambiguity over the use of the word 'integer' -- denoted by
, it always describes the set
in the modern usage of the word, unless you have seen otherwise?

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#8 2017-06-05 14:03:35

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 933

Re: My daughter need some help with this

What I have seen:
1, 2, 3, and so on = natural numbers
0, 1, 2, 3, and so on = integers
..., -3, -2, -1, 0, 1, 2, 3, ... = whole numbers

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#9 2017-06-05 18:03:32

zetafunc
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Registered: 2014-05-21
Posts: 2,130
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Re: My daughter need some help with this

Where did you see that?

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#10 2017-06-05 20:15:20

Monox D. I-Fly
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Registered: 2015-12-02
Posts: 933

Re: My daughter need some help with this

It's just how Indonesians translate them.

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#11 2017-06-08 22:20:23

iamaditya
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From: Planet Mars
Registered: 2016-11-15
Posts: 744

Re: My daughter need some help with this

Monox D. I-Fly wrote:

What I have seen:
1, 2, 3, and so on = natural numbers
0, 1, 2, 3, and so on = integers
..., -3, -2, -1, 0, 1, 2, 3, ... = whole numbers

Sorry, but you interchanged whole numbers and integers.


Practice makes a man perfect.
There is no substitute to hard work
All of us do not have equal talents but everybody has equal oppurtunities to build their talents.-APJ Abdul Kalam

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#12 2017-06-09 15:22:37

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 933

Re: My daughter need some help with this

It's just translation problem.

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