Philosophers of biology argue about whether biological species, like the Bald Eagle ( Haliaeetus leucocephalus ), are natural kinds ; even such familiar species as bird, cat, and dog cannot be established as natural types, since any plausible definitions of those species leaves the classification of some animals ambiguous.

Philosophers have found words objects of fascination since at least the 5th century BC, with the foundation of the philosophy of language.

In the spring term of 1993 he conducted the first Russia Symposium from which others sponsored by the Society of Christian Philosophers ( SCP ) have followed, and he began the China Symposia in the fall term of 1994 from which SCP symposia have followed every year since ( except 2003 ).

Philosophers of science and economists have explored these issues intensively since the work of Alexander Rosenberg and Daniel Hausman dating to 3 decades ago.

Philosophers ( and other users of logic ) spend a lot of time and effort searching for and removing ( or intentionally adding ) ambiguity in arguments, because it can lead to incorrect conclusions and can be used to deliberately conceal bad arguments.

Philosophers are not interested in the " Ship of Theseus " problem per se, but to a more basic problem which is this: How does one decide that X is the same as Y, where X describes something at one time, and Y describes another thing at a later time?

The group at this time is sometimes referred to as the " Lunar circle ", though this is a later description used by historians, and the group themselves used a variety of less specific descriptions, including " Birmingham Philosophers " or simply " fellow-schemers ".

Philosophers such as John Lucas argue that " The Block universe gives a deeply inadequate view of time.

Most of the biographical information we have of Theophrastus was provided by Diogenes Laërtius ' Lives of the Philosophers, written more than four hundred years after Theophrastus ' time.

During the same time, he became the leading professor at the newly founded University of Constantinople, bearing the honorary title of " Consul of the Philosophers " ().

Written in 1953, Worldly Philosophers has sold nearly four million copies -— the second-best-selling economics text of all time ( the first being Paul Samuelson's Economics, a highly popular university textbook ).

Some Philosophers, such as René Descartes, argue that God is absolutely omnipotent.

Philosophers usually divide the period less finely, jumping from medieval to early modern philosophy, on the assumption that no radical shifts in perspective took place in the centuries immediately before Descartes.

His book titled The Incoherence of the Philosophers marks a major turn in Islamic epistemology, as Ghazali effectively discovered philosophical skepticism that would not be commonly seen in the West until René Descartes, George Berkeley and David Hume.

Philosophers such as René Descartes and Spinoza had built whole systems of thought on this assumption.

* Philosophers Speak for Themselves: From Descartes To Kant.

* Philosophers Speak for Themselves: From Descartes to Locke ( 1958 ) editor with T. V. Smith

Philosophers associated with empiricism include Aristotle, Alhazen, Avicenna, Ibn Tufail, Robert Grosseteste, William of Ockham, Francis Bacon, Thomas Hobbes, Robert Boyle, John Locke, George Berkeley, David Hume, Leopold von Ranke, John Stuart Mill, and Karl Popper.

Philosophers like John Rawls, Thomas Hobbes, John Locke, and Jean-Jacques Rousseau helped created the foundation of social contract.

Philosophers have many differing views on what the fundamental categories of being are.

Marx explicitly developed the notion of critique into the critique of ideology and linked it with the practice of social revolution, as in the famous 11th of his Theses on Feuerbach, " Philosophers have only interpreted the world in certain ways ; the point is to change it.

Philosophers who have criticized the concept of human rights include Jeremy Bentham, Edmund Burke, Friedrich Nietzsche and Karl Marx.

Philosophers have developed two rival theories for how this happens, called endurantism and perdurantism.

Philosophers Richard Wollheim and Thomas Baldwin have argued that Sartre's attempt to show that Sigmund Freud's theory of the unconscious is mistaken is based on a misinterpretation of Freud.

Philosophers, such as Fiona Cowie and Barbara Scholz with Geoffrey Pullum have also argued against certain nativist claims in support of empiricism.

Philosophers Randall Dipert and Roderick Long have argued that Objectivist epistemology conflates the perceptual process by which judgments are formed with the way in which they are to be justified, thereby leaving it unclear how judgments with propositional structure can be validated by sensory data.

Philosophers and scientists have responded to this difficulty in a variety of ways.

Philosophers across many traditions, from Stoicism to Buddhism, have suggested that a spiritual practice is essential for personal well being.

Philosophers, he suggests, may have made the error of hypostatizing simplicity ( i. e. endowed it with a sui generis existence ), when it has meaning only when embedded in a specific context ( Sober 1992 ).

Philosophers have investigated the criteria by which a scientific theory can be said to have successfully explained a phenomenon, as well as what gives a scientific theory explanatory power.

Philosophers such as Plato, Aristotle, Al-Farabi, Avicenna, Averroes, Maimonides, Aquinas and Hegel are sometimes said to have argued that reason must be fixed and discoverable — perhaps by dialectic, analysis, or study.

Philosophers, mathematicians, and others ancient and modern such as Aristotle, Plato, Frege, Wittgenstein, Russell etc., have made a distinction between thought corresponding to reality, coherent abstractions, and that which cannot even be rationally thought.

Philosophers have argued that either Determinism is true or Indeterminism is true, but also that Free Will either exists or it does not.

Philosophers have long ignored this problem and devised systems of ethics that are powerless against our temporally biased policies.

Philosophers of science have emphasized the importance of heuristics in creative thought and constructing scientific theories.

Philosophers and social psychologists have noted that pride is a complex secondary emotion which requires the development of a sense of self and the mastery of relevant conceptual distinctions ( e. g., that pride is distinct from happiness and joy ) through language-based interaction with others.

Philosophers have tended to be more abstract in their analysis, and much of the work examining the viability of the belief concept stems from philosophical analysis.

Philosophers and scientists such as Victor Reppert, William Hasker and Alvin Plantinga have developed an argument for dualism dubbed the " Argument from Reason " and credit C. S.

Philosophers such as Karl Popper and John Eccles and quantum physicist Henry Stapp have theorized that such indeterminacy may apply even at the macroscopic scale.

This idealist understanding of philosophy as interpretation was famously challenged by Karl Marx's 11th thesis on Feuerbach ( 1845 ): " Philosophers have hitherto only interpreted the world in various ways ; the point, however, is to change it.

Philosophers, such as Karl R. Popper, have provided influential theories of the scientific method within which scientific evidence plays a central role.