Are the decimal real numbers a field.

zylo · January 18th, 2019, 09:59 AM

Is the following decimal definition of real numbers a field?
--------------------------------------------------------
Defining the natural numbers by decimal digits is trivial: 1, 2, 3, ...
One way to define all the real numbers in [0,1) is to list the natural numbers, put a period after them, and read them in reverse.
1. Is .1
2. Is .2
.
10. Is .01
95141. is .14159
------------------------------------------------------------------------------------------
It is because you can define closed addition, subtraction, multiplication and division, for any finite decimal, and the decimals are countable. See above.

Micrm@ss · January 18th, 2019, 10:32 AM

Quote:

Originally Posted by zylo $View Post$

Is the following decimal definition of real numbers a field?
--------------------------------------------------------
Defining the natural numbers by decimal digits is trivial: 1, 2, 3, ...
One way to define all the real numbers in [0,1) is to list the natural numbers, put a period after them, and read them in reverse.
1. Is .1
2. Is .2
.
10. Is .01
95141. is .14159
------------------------------------------------------------------------------------------
It is because you can define closed addition, subtraction, multiplication and division, for any finite decimal, and the decimals are countable. See above.

Are you talking about zylo's real numbers, or about the real numbers that the rest of the world uses?

zylo · January 18th, 2019, 10:53 AM

Quote:

Originally Posted by Micrm@ss $View Post$

Are you talking about zylo's real numbers, or about the real numbers that the rest of the world uses?

The real world hasn't gotten it straight yet.

AplanisTophet · January 18th, 2019, 11:34 AM

I'm just going to say "no" on this one. I trust that suffices as an answer.

zylo · January 18th, 2019, 11:47 AM

Quote:

Originally Posted by AplanisTophet $View Post$

I'm just going to say "no" on this one. I trust that suffices as an answer.

Thank goodness. Is that a promise?

Thanks for the complement. I just read your post in "the other" thread.

skipjack · January 18th, 2019, 03:06 PM

You haven't given all the real numbers in [0,1). One can pick an example from anywhere in your list and be certain that it doesn't correspond to 1/9.

January 18th, 2019, 09:59 AM	#1
zylo Banned Camp Joined: Mar 2015 From: New Jersey Posts: 1,720 Thanks: 125	Are the decimal real numbers a field. Is the following decimal definition of real numbers a field? -------------------------------------------------------- Defining the natural numbers by decimal digits is trivial: 1, 2, 3, ... One way to define all the real numbers in [0,1) is to list the natural numbers, put a period after them, and read them in reverse. 1. Is .1 2. Is .2 . 10. Is .01 95141. is .14159 ------------------------------------------------------------------------------------------ It is because you can define closed addition, subtraction, multiplication and division, for any finite decimal, and the decimals are countable. See above.
$zylo is offline$

January 18th, 2019, 11:34 AM	#4
AplanisTophet Senior Member Joined: Jun 2014 From: USA Posts: 525 Thanks: 40	I'm just going to say "no" on this one. I trust that suffices as an answer.
$AplanisTophet is offline$

January 18th, 2019, 03:06 PM	#6
skipjack Global Moderator Joined: Dec 2006 Posts: 20,644 Thanks: 2084	You haven't given all the real numbers in [0,1). One can pick an example from anywhere in your list and be certain that it doesn't correspond to 1/9. Thanks from topsquark
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