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# OpenMath Content Dictionary: setname1

Canonical URL:
http://www.openmath.org/cd/setname1.ocd
CD Base:
http://www.openmath.org/cd
CD File:
setname1.ocd
CD as XML Encoded OpenMath:
setname1.omcd
Defines:
C, N, P, Q, R, Z
Date:
2004-03-30
Version:
3
Review Date:
2006-03-30
Status:
official

This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The copyright holder grants you permission to redistribute this
document freely as a verbatim copy. Furthermore, the copyright
holder permits you to develop any derived work from this document
provided that the following conditions are met.
a) The derived work acknowledges the fact that it is derived from
this document, and maintains a prominent reference in the
work to the original source.
b) The fact that the derived work is not the original OpenMath
document is stated prominently in the derived work.  Moreover if
both this document and the derived work are Content Dictionaries
then the derived work must include a different CDName element,
chosen so that it cannot be confused with any works adopted by
the OpenMath Society.  In particular, if there is a Content
Dictionary Group whose name is, for example, `math' containing
Content Dictionaries named `math1', `math2' etc., then you should
not name a derived Content Dictionary `mathN' where N is an integer.
However you are free to name it `private_mathN' or some such.  This
is because the names `mathN' may be used by the OpenMath Society
for future extensions.
compilation of derived works, but keep paragraphs a) and b)
intact.  The simplest way to do this is to distribute the derived
work under the OpenMath license, but this is not a requirement.
society at http://www.openmath.org.

This CD defines common sets of mathematics

Written by J.H. Davenport on 1999-04-18.
Revised to add Zm, GFp, GFpn on 1999-11-09.
Revised to add QuotientField and A on 1999-11-19.

## P

Role:
constant
Description:

This symbol represents the set of positive prime numbers.

Commented Mathematical property (CMP):
for all n | n is a positive prime number is equivalent to: n is a natural number and n > 1 and ((n=a*b and a and b are natural numbers) implies ((a=1 and b=n) or (b=1 and a=n)))
Formal Mathematical property (FMP):
$\forall n.n\in \mathbb{P}\equiv \left(n\in \mathbb{N}\wedge n>1\wedge \left(n=ab\wedge a\in \mathbb{N}\wedge b\in \mathbb{N}⇒\left(a=1\wedge b=n\right)\vee \left(b=1\wedge a=n\right)\right)\right)$
Signatures:
sts

 [Next: N] [Last: C] [Top]

## N

Role:
constant
Description:

This symbol represents the set of natural numbers (including zero).

Commented Mathematical property (CMP):
for all n | n in the natural numbers is equivalent to saying n=0 or n-1 is a natural number
Formal Mathematical property (FMP):
$\forall n.n\in \mathbb{N}⇒\left(n=0\right)\vee \left(n-1\right)\in \mathbb{N}$
Signatures:
sts

 [Next: Z] [Previous: P] [Top]

## Z

Role:
constant
Description:

This symbol represents the set of integers, positive, negative and zero.

Commented Mathematical property (CMP):
for all z | the statements z is an integer and z is a natural number or -z is a natural number are equivalent
Formal Mathematical property (FMP):
$\forall z.z\in \mathbb{Z}⇒z\in \mathbb{N}\vee -z\in \mathbb{N}$
Signatures:
sts

 [Next: Q] [Previous: N] [Top]

## Q

Role:
constant
Description:

This symbol represents the set of rational numbers.

Commented Mathematical property (CMP):
for all z where z is a rational, there exists integers p and q with q > 1 and p/q = z
Formal Mathematical property (FMP):
$\forall z.z\in \mathbb{Q}⇒\exists p,q.p\in \mathbb{Z}\wedge q\in \mathbb{Z}\wedge q\ge 1\wedge z=\frac{p}{q}$
Commented Mathematical property (CMP):
for all a,b | a,b rational with a<b implies there exists rational a,c s.t. a<c and c<b
Formal Mathematical property (FMP):
$\forall a,b.a\in \mathbb{Q}\wedge b\in \mathbb{Q}\wedge a
Signatures:
sts

 [Next: R] [Previous: Z] [Top]

## R

Role:
constant
Description:

This symbol represents the set of real numbers.

Commented Mathematical property (CMP):
S \subset R and exists y in R : forall x in S x <= y) implies exists z in R such that (( forall x in S x <= z) and ((forall x in S x <= w) implies z <= w)
Formal Mathematical property (FMP):
$S\subset \mathbb{R}\wedge \exists y.y\in \mathbb{R}\wedge \forall x.x\in S\wedge x\le y⇒\exists z.z\in \mathbb{R}\wedge \forall x.x\in S⇒x\le z\wedge \left(\forall x.x\in S⇒x\le w⇒z\le w\right)$
Signatures:
sts

 [Next: C] [Previous: Q] [Top]

## C

Role:
constant
Description:

This symbol represents the set of complex numbers.

Commented Mathematical property (CMP):
for all z | if z is complex then there exist reals x,y s.t. z = x + i * y
Formal Mathematical property (FMP):
$\forall z.z\in \mathbb{C}⇒\exists x,y.x\in \mathbb{R}\wedge y\in \mathbb{R}\wedge z=x+iy$
Signatures:
sts

 [First: P] [Previous: R] [Top]

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