Math Is Fun Forum

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

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.

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MathsIsFun

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Registered: 2005-01-21

Posts: 7,713

Re: My daughter need some help with this

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

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Monox D. I-Fly

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From: Indonesia

Registered: 2015-12-02

Posts: 2,000

Re: My daughter need some help with this

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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greg1313

Member

Registered: 2016-12-19

Posts: 20

Re: My daughter need some help with this

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.

Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

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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Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

zetafunc

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Registered: 2014-05-21

Posts: 2,436

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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?

Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

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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Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

zetafunc

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Registered: 2014-05-21

Posts: 2,436

Website

Re: My daughter need some help with this

Where did you see that?

Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

Re: My daughter need some help with this

It's just how Indonesians translate them.

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Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

iamaditya

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From: Planet Mars

Registered: 2016-11-15

Posts: 821

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

Sorry, but you interchanged whole numbers and integers.

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Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

Re: My daughter need some help with this

It's just translation problem.

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Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.