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LessThan[y]

is an operator form that yields x<y when applied to an expression x.

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Properties & Relations  
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LessThan

LessThan[y]

is an operator form that yields x<y when applied to an expression x.

Details

Examples

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Basic Examples  (3)

Check numeric order:

Wolfram Language code: LessThan[4][2]

For symbolic expressions, the result is given as an inequality:

Wolfram Language code: LessThan[y][x]

Select the numbers that are smaller than 10 in a list:

Wolfram Language code: Select[{0, 5, 10, 15}, LessThan[10]]

Scope  (4)

Use LessThan with numbers:

Wolfram Language code: LessThan[10][6]

Use LessThan with numeric Quantity objects:

Wolfram Language code: LessThan[Quantity[1, "Hour"]][Quantity[50, "Minutes"]]

Use LessThan with dates:

Wolfram Language code: LessThan[Today][Yesterday]
Wolfram Language code: LessThan[DateObject[{2015, 8, 1}, "Day", "Gregorian", -6.]][DateObject[{2015, 6, 1}, "Day", "Gregorian", -6.]]

Use symbolic values:

Wolfram Language code: LessThan[5][x]
Wolfram Language code: LessThan[x][5]

Applications  (1)

Countries with small area:

Wolfram Language code: EntityValue[EntityClass["Country", {"Area" -> LessThan[Quantity[100, "Kilometers" ^ 2]]}], "Entities"]

Properties & Relations  (2)

Obtain the populations of the class of countries with an area smaller than 40 square kilometers:

Wolfram Language code: EntityValue[EntityClass["Country", {"Area" -> LessThan[Quantity[40, "Kilometers" ^ 2]]}], "Population"]

This is the total:

Wolfram Language code: Total[%]

Compare the alternative notations:

Wolfram Language code: Select[{0, 5, 10, 15}, Less[#, 10]&]
Wolfram Language code: Select[{0, 5, 10, 15}, LessThan[10]]
Wolfram Language code: Select[LessThan[10]][{0, 5, 10, 15}]
Wolfram Research (2015), LessThan, Wolfram Language function, https://reference.wolfram.com/language/ref/LessThan.html.

Text

Wolfram Research (2015), LessThan, Wolfram Language function, https://reference.wolfram.com/language/ref/LessThan.html.

CMS

Wolfram Language. 2015. "LessThan." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/LessThan.html.

APA

Wolfram Language. (2015). LessThan. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/LessThan.html

BibTeX

@misc{reference.wolfram_2026_lessthan, author="Wolfram Research", title="{LessThan}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/LessThan.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_lessthan, organization={Wolfram Research}, title={LessThan}, year={2015}, url={https://reference.wolfram.com/language/ref/LessThan.html}, note=[Accessed: 12-June-2026]}