theories

n.

a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena

"true in fact and theory"

a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena

"a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"

同义词：hypothesispossibility

a belief that can guide behavior

"the architect has a theory that more is less"; "they killed him on the theory that dead men tell no tales"

A new mixing of Hartree–Fock and local density‐functional theories
Building Theories from Case Study Research
2. Building Theories from Case Study Research.
EISENHARDT, K. M. . Building theories from case study research.
The large N limit of superconformal field theories and supergravity
Large N field theories, string theory and gravity
Comparison of quantum and semiclassical radiation theories with application to the beam maser
Biological roles of oligosaccharides: all of the theories are correct.
Proposed Experiment to Test Local Hidden-Variable Theories
Unified theories of cognition.