modal logic

Table of Contents

Introduction References & Edit History Quick Facts & Related Topics

Discover

Meghan, Duchess of Sussex in 2019. (Meghan Markle, British royalty)

6 Things You Should Know About Meghan, Duchess of Sussex

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

Hindu Holi Festival celebrations with colored water, powder and colorful flower petals thrown over celebrants at a Hindu temple in Mathura, Uttar Pradesh, India on March 24, 2021.

Holi: Festival of Colors

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

modal logic: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	alethic modal logic

Topics

possible world S4 S5 T Brouwerian system rule of necessitation modality formal logic logic applied logic metalogic set theory fuzzy logic predicate calculus propositional calculus mereology many-valued logic history of logic philosophy of logic

Dig Deeper: More Articles That Discuss This Topic

formal logic: Modal logic