If, as it now seems, the universe falls considerably short of critical density, theorists have already begun to add to their equations something called the cosmological constant.

However, it was only in the fifteenth century that theorists began making a hard distinction between improvised and written music.

Perhaps influenced by the rapid development of multiple-winner voting methods, theorists began to publish new findings about single-winner methods in the late 19th century.

He wondered how soon the European "theorists" would begin to build rockets and overtake him.

During the, several theorists began to study the cognitive load of novices (those with little or no prior knowledge of the subject matter) during problem solving.

Beginning in the 1970s, cognitive theorists began teaching that reading is really an act of thinking and organization.

After infiltrating art and literature departments, post-structuralist theorists began to consolidate their position in architecture schools.

The theorists were adamant, though, and thus began the hunt for the 'missing mass'- unobserved dark stuff that would bring W up to 1.

The doctrine fell out of use in the Classical era, when composers and theorists began to find it excessively mechanical and unnatural.

Then theorists began to object to the principle of the drive.