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Nothing, the complete absence of anything, has been a matter of philosophical debate since at least the 5th century BC. Early Greek philosophers argued that it was impossible for ''nothing'' to exist. The atomists allowed ''nothing'' but only in the spaces between the invisibly small atoms. For them, all space was filled with atoms. Aristotle took the view that there exists matter and there exists space, a receptacle into which matter objects can be placed. This became the paradigm for classical scientists of the modern age like Newton. Nevertheless, some philosophers, like Descartes, continued to argue against the existence of empty space until the scientific discovery of a physical vacuum.

Existentialists like Sartre and Heidegger (as interpreted by Sartre) have associated ''nothing'' with consciousness. Some writers have made connections between Heidegger's concept of ''nothing'' and the nirvana of Eastern religions.

Modern science does not equate ''vacuum'' with ''nothing''. Indeed, the vacuum in quantum field theory is filled with virtual particles. The quantum vacuum is often viewed as a modern version of an aether theory.

Philosophy

Western philosophy

Some would consider the study of "nothing" to be foolish. A typical response of this type is voiced by Giacomo Casanova (1725–1798) in conversation with his landlord, one Dr. Gozzi, who also happens to be a priest:

However, "nothingness" has been treated as a serious subject for a very long time. In philosophy, to avoid linguistic traps over the meaning of "nothing", a phrase such as ''not-being'' is often employed to make clear what is being discussed.

Parmenides

One of the earliest Western philosophers to consider nothing as a concept was Parmenides (5th century BC), who was a Greek philosopher of the monist school. He argued that "nothing" cannot exist by the following line of reasoning: To speak of a thing, one has to speak of a thing that exists. Since we can speak of a thing in the past, this thing must still exist (in some sense) now, and from this he concludes that there is no such thing as change. As a corollary, there can be no such things as ''coming-into-being'', ''passing-out-of-being'', or ''not-being''.

Parmenides was taken seriously by other philosophers, influencing, for instance, Socrates and Plato. Aristotle gives Parmenides serious consideration but concludes, "Although these opinions seem to follow logically in a dialectical discussion, yet to believe them seems next door to madness when one considers the facts."

In modern times, Albert Einstein's concept of spacetime has led many scientists, including Einstein himself, to adopt a position remarkably similar to Parmenides. On the death of his friend Michele Besso, Einstein consoled his widow with the words, "Now he has departed from this strange world a little ahead of me. That signifies nothing. For those of us that believe in physics, the distinction between past, present and future is only a stubbornly persistent illusion."

Leucippus

Leucippus (early 5th century BC), one of the atomists, along with other philosophers of his time, made attempts to reconcile this monism with the everyday observation of motion and change. He accepted the monist position that there could be no motion without a void. The void is the opposite of being. It is ''not-being''. On the other hand, there exists something known as an absolute plenum, a space filled with matter, and there can be no motion in a plenum because it is completely full. But, there is not just one monolithic plenum, for existence consists of a multiplicity of plenums. These are the invisibly small "atoms" of Greek atomist theory, later expanded by Democritus (c. 460–370 BC), which allows the void to "exist" between them. In this scenario, macroscopic objects can ''come-into-being'', move through space, and pass into ''not-being'' by means of the coming together and moving apart of their constituent atoms. The void must exist to allow this to happen, or else the "frozen world" of Parmenides must be accepted.

Bertrand Russell points out that this does not exactly defeat the argument of Parmenides but, rather, ignores it by taking the rather modern scientific position of starting with the observed data (motion, etc.) and constructing a theory based on the data, as opposed to Parmenides' attempts to work from pure logic. Russell also observes that both sides were mistaken in believing that there can be no motion in a plenum, but arguably motion cannot ''start'' in a plenum. Cyril Bailey notes that Leucippus is the first to say that a "thing" (the void) might be real without being a body and points out the irony that this comes from a materialistic atomist. Leucippus is therefore the first to say that "nothing" has a reality attached to it.

Aristotle, Newton, Descartes

Aristotle (384–322 BC) provided the classic escape from the logical problem posed by Parmenides by distinguishing things that are ''matter'' and things that are ''space''. In this scenario, space is not "nothing" but, rather, a receptacle in which objects of matter can be placed. The true void (as "nothing") is different from "space" and is removed from consideration. This characterization of space reached its pinnacle with Isaac Newton who asserted the existence of absolute space. René Descartes, on the other hand, returned to a Parmenides-like argument of denying the existence of space. For Descartes, there was matter, and there was extension of matter leaving no room for the existence of "nothing".

The idea that space can actually be empty was generally still not accepted by philosophers who invoked arguments similar to the plenum reasoning. Although Descartes views on this were challenged by Blaise Pascal, he declined to overturn the traditional belief, '' horror vacui'', commonly stated as "nature abhors a vacuum". This remained so until Evangelista Torricelli invented the barometer in 1643 and showed that an empty space appeared if the mercury tube was turned upside down. This phenomenon being known as the Torricelli vacuum and the unit of vacuum pressure, the torr, being named after him. Even Torricelli's teacher, the famous Galileo Galilei had previously been unable to adequately explain the sucking action of a pump.

John the Scot

John the Scot, or Johannes Scotus Eriugena (c. 815–877) held many surprisingly heretical beliefs for the time he lived in for which no action appears ever to have been taken against him. His ideas mostly stem from, or are based on his work of translating pseudo-Dionysius. His beliefs are essentially pantheist and he classifies evil, amongst many other things, into ''not-being''. This is done on the grounds that evil is the opposite of good, a quality of God, but God can have no opposite, since God is everything in the pantheist view of the world. Similarly, the idea that God created the world out of "nothing" is to be interpreted as meaning that the "nothing" here is synonymous with God.

G. W. F. Hegel

Georg Wilhelm Friedrich Hegel (1770–1831) is the philosopher who brought the dialectical method to a new pinnacle of development. According to Hegel in ''Science of Logic'', the dialectical methods consists of three steps. First, a thesis is given, which can be any proposition in logic. Second, the antithesis of the thesis is formed and, finally, a synthesis incorporating both thesis and antithesis. Hegel believed that no proposition taken by itself can be completely true. Only the whole can be true, and the dialectical synthesis was the means by which the whole could be examined in relation to a specific proposition. Truth consists of the whole process. Separating out thesis, antithesis, or synthesis as a stand-alone statement results in something that is in some way or other untrue. The concept of "nothing" arises in Hegel right at the beginning of his ''Logic''. The whole is called by Hegel the "Absolute" and is to be viewed as something spiritual. Hegel then has:
* Thesis: the absolute is pure being
* Antithesis: the absolute is nothing
* Synthesis: the absolute is becoming

Existentialists

The most prominent figure among the existentialists is Jean-Paul Sartre, whose ideas in his book ''Being and Nothingness'' (''L'être et le néant'') are heavily influenced by ''Being and Time'' (''Sein und Zeit'') of Martin Heidegger, although Heidegger later stated that he was misunderstood by Sartre. Sartre defines two kinds of "being" (être). One kind is ''être-en-soi'', the brute existence of things such as a tree. The other kind is ''être-pour-soi'' which is consciousness. Sartre claims that this second kind of being is "nothing" since consciousness cannot be an object of consciousness and can possess no essence. Sartre, and even more so, Jaques Lacan, use this conception of nothing as the foundation of their atheist philosophy. Equating nothingness with being leads to creation from nothing and hence God is no longer needed for there to be existence.

Eastern philosophy

The understanding of "nothing" varies widely between cultures, especially between Western and Eastern cultures and philosophical traditions. For instance, ''Śūnyatā'' (emptiness), unlike "nothingness", is considered to be a state of mind in some forms of Buddhism (see Nirvana, mu, and Bodhi). Achieving "nothing" as a state of mind in this tradition allows one to be totally focused on a thought or activity at a level of intensity that they would not be able to achieve if they were consciously thinking. A classic example of this is an archer attempting to erase the mind and clear the thoughts to better focus on the shot. Some authors have pointed to similarities between the Buddhist conception of nothingness and the ideas of Martin Heidegger and existentialists like Sartre, although this connection has not been explicitly made by the philosophers themselves.

In some Eastern philosophies, the concept of "nothingness" is characterized by an egoless state of being in which one fully realizes one's own small part in the cosmos.

The Kyoto School handles the concept of nothingness as well.

Science

Despite the proven existence of vacuum, scientists through the 17th to 19th centuries thought there must be a medium pervading all space that allowed the transmission of light or gravity. Thus, in this period, it was not accepted that complete ''nothing'' was possible. Theories describing such a medium are collectively known as aether theories, so named as an evocation of the aether, the classical element from Greek philosophy. In particular, the medium that is supposed to allow the transmission of light is called the luminiferous aether. This became the centre of attention after James Clerk Maxwell proposed that light was an electromagnetic wave in 1865.

Early aether theories include those of Robert Hooke (1665) and Christiaan Huygens (1690). Newton also had an aether theory, but to Newton, it was not the medium of transmission since he theorised light was composed of "corpuscles" which moved by simple mechanical motion. He needed the aether instead to explain refraction. Early theories generally proposed a mechanical medium of some sort, allowing the possibility of the same medium supporting both light and gravity. Proof that light has a wave nature, rather than Newton's corpuscles, was provided by Thomas Young in his 1803 interference experiment, seemingly confirming the need for an aether. The most well known attempt to detect the existence of the aether was conducted by Albert A. Michelson in an experiment of 1881, later repeated with Edward W. Morley in 1887 with more precision. This failed to show the desired effect, but reluctant to abandon the aether theory, various attempts where made to modify it to account for the Michelson-Morley result. Finally, Albert Einstein, building on the work of Hendrik Lorentz, published his theory of special relativity in 1905 which dispenses entirely with the need for a luminiferous aether to explain the transmission of light.

Although a physical medium was no longer required, the concept of aether still did not entirely vanish. It remained necessary to assign properties to the vacuum for various purposes. In some respects ''vacuum'' and ''aether'' are treated as synonyms by science. In modern quantum field theory, a completely empty vacuum is not at zero-point energy, the lowest possible energy state. First proposed by Paul Dirac in 1927, the lowest energy state has constant random vacuum fluctuations which bring into existence short-lived virtual particles. This is somewhat reminiscent of early philosophical plenum ideas, and means that ''vacuum'' and ''nothing'' are certainly not synonyms.Milonni, p. 35

See also

* A Universe from Nothing
* Absolute zero
* Action at a distance
* Big Bounce
* Cosmogony
* Dark matter
* Empty (disambiguation)
* Empty set
* Eternal inflation
* Everything
* Ex nihilo
* False vacuum
* Meontology
* Meaning of life
* Mu (negative)
* Negation (linguistics)
* Negative theology
* Nihilism
* No
* Nobody (disambiguation)
* Nothing comes from nothing
* Quantum vacuum fluctuations
* Ultimate fate of the universe
* Vacuum
* Vanitas
* Vacuous truth
* Void (disambiguation)
* Zero

Notes

References

* Hsu, Jong-Ping, ''Einstein's Relativity and Beyond: New Symmetry Approaches'', World Scientific, 2000 .
* Milonni, Peter W., ''The Quantum Vacuum: An Introduction to Quantum Electrodynamics'', Academic Press, 2013 .
* Pieper, Josef; Wald, Berthold, ''For the Love of Wisdom: Essays on the Nature of Philosophy'', Translator: Roger Wasserman, Ignatius Press, 2006 .
* Russell, Bertrand. ''History of Western Philosophy'', Routledge, 1995 .
* Schaffner, Kenneth F., ''Nineteenth-Century Aether Theories'', Elsevier, 2016 .
* Whittaker, Edmund Taylor, ''A History of the Theories of Aether and Electricity from the age of Descrates to the Close of the Ninenteenth Century'', London: Longmans Green & Co, 1910 .

Further reading

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External links

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Existentialist concepts
Perception
Ontology
Concepts in metaphysics