# NonPositiveReals

represents the domain of non-positive real numbers.

# Details

• xNonPositiveReals evaluates immediately if x is a numeric quantity.
• Simplify[exprNonPositiveReals,assum] can be used to try to determine whether an expression corresponds to a non-positive real number under the given assumptions.
• (x1|x2|)NonPositiveReals and {x1,x2,}NonPositiveReals test whether all xi are non-positive real numbers.
• NonPositiveReals is output in StandardForm and TraditionalForm as . This typeset form can be input using npreals.

# Examples

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## Basic Examples(3)

is a non-positive real number:

If is a real number, is a non-positive real number:

Find non-positive real solutions of an equation:

## Scope(4)

Test if a numeric quantity is non-positive:

Make domain membership assumptions:

Specify the default domain over which a function should work:

Test whether several numbers are non-positive reals:

If any number is explicitly not a non-positive number, the result is False:

## Applications(1)

Testing membership in the non-positive reals is a fast way to verify non-positivity of a large list:

## Properties & Relations(4)

Membership in NonPositiveReals is equivalent to membership in Reals along with non-positivity:

NonPositiveReals is contained in Complexes:

NonPositiveReals is disjoint from PositiveReals:

It intersects NonNegativeReals:

Wolfram Research (2019), NonPositiveReals, Wolfram Language function, https://reference.wolfram.com/language/ref/NonPositiveReals.html.

#### Text

Wolfram Research (2019), NonPositiveReals, Wolfram Language function, https://reference.wolfram.com/language/ref/NonPositiveReals.html.

#### CMS

Wolfram Language. 2019. "NonPositiveReals." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/NonPositiveReals.html.

#### APA

Wolfram Language. (2019). NonPositiveReals. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/NonPositiveReals.html

#### BibTeX

@misc{reference.wolfram_2024_nonpositivereals, author="Wolfram Research", title="{NonPositiveReals}", year="2019", howpublished="\url{https://reference.wolfram.com/language/ref/NonPositiveReals.html}", note=[Accessed: 15-August-2024 ]}

#### BibLaTeX

@online{reference.wolfram_2024_nonpositivereals, organization={Wolfram Research}, title={NonPositiveReals}, year={2019}, url={https://reference.wolfram.com/language/ref/NonPositiveReals.html}, note=[Accessed: 15-August-2024 ]}