Many philosophers have attempted to reduce the number of distinct ontological categories.

A philosopher attempts a theoretical understanding of a "vast and amorphous" phenomenon.

For nearly a century, physicists and philosophers have been attempting to explain the physical meaning of quantum states.

In the 1920s-30s, many European philosophers attempted to reform traditional philosophy by means of mathematical logic.

Many philosophers and historians have attempted to define or describe analytic philosophy.

Translation and interpretation are two other problems that philosophers of language have attempted to confront.

Early Greek philosophers attempted to explain order in nature, anticipating modern concepts.

Some philosophers have attempted to remove possible worlds, and reduce them to other entities.

A few of the questions philosophers of biology have attempted to answer, for example, include:

"Far greater philosophers than I have attempted to answer that question over the ages," he said, shaking his head.