Logical thinking is necessarily deductive; it is based upon hypothetical concepts and axioms.

Exotic matter is a hypothetical concept of particle physics.

Time travel is the hypothetical concept of traveling in time.

For Weber, the conduct of social science depends upon the construction of hypothetical concepts in the abstract.

This hypothetical concept has been dubbed the Bracewell probe after its inventor.

This is the hypothetical concept of "total risk", by combining particular risk factors.

The remaining 70 percent may consist of dark energy, which remains at this moment a hypothetical concept.

Mortality had remained a conveniently hypothetical concept, an idea to ponder in the abstract.

Truly isolated systems cannot exist in nature, other than possibly the universe itself, and they are thus hypothetical concepts only.