The phrase "a pair of worlds" is correct and usable in written English.
It can be used to describe two distinct realms, environments, or perspectives that are being compared or contrasted.
Example: "In the novel, the author explores the concept of a pair of worlds, one filled with magic and the other rooted in reality."
Alternatives: "two realms" or "duo of worlds".
A closely related argument holds that we can conceive of a pair of worlds in which some pair of spheres has been replaced by some other pair of spheres.
The intension of (5) is the function that assigns the true to a pair of worlds
Before receiving the hard information that the soda is for you, the waiter's knowledge-base is modelled by a pair of worlds (hereafter information states) x and y such that in x you ordered the soda and your friend the espresso, and in y you ordered the espresso and your friend the soda.
Paull and Sider appeal to a plausible principle to show that the existence of Petrie's w1 and w2 entail the existence of a pair of worlds that constitutes a counterexample to the global supervenience of A-properties on B-properties (1992, 838).
"So I guess we're gonna be roomies!" she says brightly to a pair of world-weary sex workers.
One of his "relics" is a pair of World War I cavalry boots, referring to an imaginary soldier who has experienced every war in United States history.
Having won a pair of World Cups and the Atlanta Olympics in 1996, the Americans had changed the way women's sports were viewed.
An antique Buddha head perches on a side table, jauntily wearing a pair of World War II aviator goggles that Givenchy picked up on a trip to China.
(In its maniacal attention to detail, "Life and Times" is clearly the work of a pair of world-class obsessive-compulsives).
The four-year-old restaurant Taka inhabits a pair of World War I-era brick-and-iron commercial buildings that were joined by previous owners to create a soaring atriumlike space on two levels.
