set theory

When cities started adding chlorine to their water supplies, in the early 1900s, it set off public outcry.
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
Submission is set in a France seven years from now that is dominated by a Muslim president intent on imposing Islamic law.
Houellebecq’s Incendiary Novel Imagines France With a Muslim President|Pierre Assouline|January 9, 2015|DAILY BEAST
In the last year, her fusion exercise class has attracted a cult following and become de rigueur among the celebrity set.
How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
I wonder what that lady is doing now, and if she knows what she set in motion with Archer?
‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS|Marlow Stern|January 8, 2015|DAILY BEAST

Empire will be hate-watched and may set off some conversations on its way from fading from our minds.
‘Empire’ Review: Hip-Hop Musical Chairs with an Insane Soap Opera Twist|Judnick Mayard|January 8, 2015|DAILY BEAST
You would not think it too much to set the whole province in flames so that you could have your way with this wretched child.
St. Martin's Summer|Rafael Sabatini
In the year of misery, of agony and suffering in general he had endured, he had settled upon one theory.
The Homesteader|Oscar Micheaux
I take the Extream Bells, and set down the six Changes on them thus.
Tintinnalogia, or, the Art of Ringing|Richard Duckworth and Fabian Stedman
Dean Swift was indeed a misanthrope by theory, however he may have made exception to private life.
Gulliver's Travels|Jonathan Swift
She set off down Trafalgar Road in the mist and the rain, glad that she had been compelled to walk.
Hilda Lessways|Arnold Bennett

British Dictionary definitions for set theory

set theory

noun

maths the branch of mathematics concerned with the properties and interrelationships of sets

logic a theory constructed within first-order logic that yields the mathematical theory of classes, esp one that distinguishes sets from proper classes as a means of avoiding certain paradoxes

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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British Dictionary definitions for set theory

noun