set theory
noun
: a branch of mathematics or of symbolic logic that deals with the nature and relations of sets
set theoretic
adjective
Examples of set theory in a Sentence
Recent Examples on the Web
Ultimately, most experts now agree on a framework called the Zermelo-Fraenkel set theory with the axiom of choice, or ZFC for short.
—
Manon Bischoff, Scientific American, 26 May 2026
But the resolution to Poincaré’s confusion would come not from geometry, but from a nascent branch of logic called set theory.
—Konstantin Kakaes, Quanta Magazine, 20 May 2026
Descriptive set theory dates back to Georg Cantor, who proved in 1874 that there are different sizes of infinity.
—Joseph Howlett, Wired News, 4 Jan. 2026
Cantor’s set theory flips the script in a sense.
—Big Think, 25 Nov. 2025
But the viewer doesn’t need to know a thing about set theory to find her organization of lines and angles beautiful.
—Grace Edquist, Vogue, 25 Nov. 2024
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Manon Bischoff, Scientific American, 26 May 2026
But the resolution to Poincaré’s confusion would come not from geometry, but from a nascent branch of logic called set theory.
—Konstantin Kakaes, Quanta Magazine, 20 May 2026
Descriptive set theory dates back to Georg Cantor, who proved in 1874 that there are different sizes of infinity.
—Joseph Howlett, Wired News, 4 Jan. 2026
Cantor’s set theory flips the script in a sense.
—Big Think, 25 Nov. 2025
But the viewer doesn’t need to know a thing about set theory to find her organization of lines and angles beautiful.
—Grace Edquist, Vogue, 25 Nov. 2024
Cite this Entry
“Set theory.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/set%20theory. Accessed 2 Jun. 2026.
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