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  1. Universes.John Leslie - 1989 - Routledge.
    One of the first books to address what has come to be known as the philosophy of cosmology, Universes asks, "Why does the universe exist?", arguing that the universe is "fine tuned for producing life." For example, if the universe's early expansion speed had been smaller by one part in a million, then it would have recollapsed rapidly; with an equivalently tiny speed increase, no galaxies would have formed. Either way, this universe would have been lifeless.
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  2. Is the End of the World Nigh?John Leslie - 1990 - Philosophical Quarterly 40 (158):65-72.
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  3.  34
    Cosmology and Theology.John Leslie - forthcoming - Stanford Encyclopedia of Philosophy.
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  4. Design and the Anthropic Principle.John Leslie - 1992 - Biology and Philosophy 7 (3):349-354.
  5.  29
    The End of the World: The Science and Ethics of Human Extinction.John Leslie - 1996 - Routledge.
    Are we in imminent danger of extinction? Yes, we probably are, argues John Leslie in his chilling account of the dangers facing the human race as we approach the second millenium. The End of the World is a sobering assessment of the many disasters that scientists have predicted and speculated on as leading to apocalypse. In the first comprehensive survey, potential catastrophes - ranging from deadly diseases to high-energy physics experiments - are explored to help us understand the risks. One (...)
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  6. Time and the Anthropic Principle.John Leslie - 1992 - Mind 101 (403):521-540.
    Carter’s anthropic principle reminds us that intelligent life can find itself only in life-permitting times, places or universes. The principle concerns a possible observational selection effect, not a designing deity. It has no special concern with humans, nor does it say that intelligent life is inevitable and common. Barrow and Tipler, who discuss all this, are not biologically ignorant. As argued in "Universes" (Leslie, 1989) they may well be right in thinking that "fine tuning" of force strengths and particle masses, (...)
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  7.  13
    Value and Existence.John Leslie - 1979 - Blackwell.
  8.  37
    Infinite Minds: A Philosophical Cosmology.John Leslie - 2001 - Oxford University Press.
    The cosmos exists just because of the ethical need for it We, and all the intricate structures of our universe, exist as thoughts in a divine mind that knows everything worth knowing. There could also be infinitely many other universes in this mind....It may be hard to believe that the universe is as Leslie says it is--but it is also hard to resist his compelling ideas and arguments.
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  9. The Mystery of Existence: Why is There Anything at All.John Leslie & Robert Lawrence Kuhn (eds.) - 2013 - Wiley-Blackwell.
    This compelling study of the origins of all that exists, including explanations of the entire material world, traces the responses of philosophers and scientists to the most elemental and haunting question of all: why is _anything_ here—or anything _anywhere_? Why is there something rather than nothing? Why not nothing? It includes the thoughts of dozens of luminaries from Plato and Aristotle to Aquinas and Leibniz to modern thinkers such as physicists Stephen Hawking and Steven Weinberg, philosophers Robert Nozick and Derek (...)
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  10. Observership in Cosmology: The Anthropic Principle.John Leslie - 1983 - Mind 92 (368):573-579.
  11.  53
    Doom and Probabilities.John Leslie - 1993 - Mind 102 (407):489-491.
  12. Anthropic Principle, World Ensemble, Design.John Leslie - 1982 - American Philosophical Quarterly 19 (2):141 - 151.
  13.  20
    Observer-Relative Chances and the Doomsday Argument.John Leslie - 1997 - Inquiry : An Interdisciplinary Journal of Philosophy 40 (4):427 – 436.
    Suppose various observers are divided randomly into two groups, a large and a small. Not knowing into which group anyone has been sent, each can have strong grounds for believing in being in the large group, although recognizing that every observer in the other group has equally powerful reasons for thinking of this other group as the large one. Justified belief can therefore be observer-relative in a rather paradoxical way. Appreciating this allows one to reject an intriguing new objection against (...)
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  14. Life, Death, and Meaning: Key Philosophical Readings on the Big Questions.Margaret A. Boden, Richard B. Brandt, Peter Caldwell, Fred Feldman, John Martin Fischer, Richard Hare, David Hume, W. D. Joske, Immanuel Kant, Frederick Kaufman, James Lenman, John Leslie, Steven Luper-Foy, Michaelis Michael, Thomas Nagel, Robert Nozick, Derek Parfit, George Pitcher, Stephen E. Rosenbaum, David Schmidtz, Arthur Schopenhauer, David B. Suits, Richard Taylor & Bernard Williams - 2004 - Rowman & Littlefield Publishers.
    Do our lives have meaning? Should we create more people? Is death bad? Should we commit suicide? Would it be better if we were immortal? Should we be optimistic or pessimistic? Life, Death, and Meaning brings together key readings, primarily by English-speaking philosophers, on such 'big questions.'.
     
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  15.  35
    No Inverse Gambler's Fallacy in Cosmology.John Leslie - 1988 - Mind 97 (386):269-272.
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  16.  83
    Anthropic Explanations in Cosmology.John Leslie - 1986 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1986:87 - 95.
    Cosmologists using the Anthropic Principle claim that if our universe had been much different then nobody would exist to observe it. This may become explanatory when one accepts the actual existence of multiple "universes": gigantic, largely or entirely separate systems having very varied properties. Ian Hacking has urged, though, that an Inverse Gambler's Fallacy is committed during many attempts to formulate anthropic explanations. Besides disagreeing with him, the paper makes several further points in support of such explanations, in particular against (...)
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  17.  37
    Our Place in the Cosmos.John Leslie - 2000 - Philosophy 75 (1):5-24.
    Our world seems fine tuned in life-permitting ways. If the cosmos contains many universes, only the appropriately tuned ones can be seen by living beings. An alternative is that God acted as Fine Tuner. We might account for God in terms of an eternally powerful ethical requirement that God exists, rejecting J. L. Mackie's judgment that absolute ethical requirements are incredibly queer. Mackie viewed such requirements as logically possible, so if they were absent then this would seem a matter of (...)
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  18.  83
    Anthropic Prediction.John Leslie - 1994 - Philosophia 23 (1-4):117-144.
  19.  44
    Ensuring Two Bird Deaths with One Throw.John Leslie - 1991 - Mind 100 (1):73-86.
  20. How to Draw Conclusions From a Fine-Tuned Cosmos.John Leslie - 1997 - In Physics, Philosophy, and Theology: A Common Quest for Understanding. Vatican Observatory.
    Physical force strengths, particle masses, the early cosmic expansion speed and many other factors seem "fine tuned for life". Had they been slightly different, life’s evolution would have been impossible. The situation resembles catching a fish with an apparatus unable to catch ones slightly differently sized. One explanation is that the lake contains fish of many different sizes: multiple universes with randomized characteristics, most of them unobservable because observers cannot evolve in them. Another is that God created a fish of (...)
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  21.  15
    The Need to Generate Happy People.John Leslie - 1989 - Philosophia 19 (1):29-33.
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  22. The End of the World.John Leslie - 2000 - Mind 109 (433):155-158.
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  23.  22
    Doomsday Revisited.John Leslie - 1992 - Philosophical Quarterly 42 (166):85-89.
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  24. Current Issues in Teleology.John Leslie - 1986 - Univ Pr of America.
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  25.  11
    Testing the Doomsday Argument.John Leslie - 1994 - Journal of Applied Philosophy 11 (1):31-44.
  26.  21
    Efforts to Explain All Existence.John Leslie - 1978 - Mind 87 (346):181-194.
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  27.  67
    The Risk That Humans Will Soon Be Extinct.John Leslie - 2010 - Philosophy 85 (4):447-463.
    If it survives for a little longer, the human race will probably start to spread across its galaxy. Germ warfare, though, or environmental collapse or many another factor might shortly drive humans to extinction. Are they likely to avoid it? Well, suppose they spread across the galaxy. Of all humans who would ever have been born, maybe only one in a hundred thousand would have lived as early as you. If, in contrast, humans soon became extinct then because of the (...)
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  28.  49
    A Neoplatonist's Pantheism.John Leslie - 1997 - The Monist 80 (2):218-231.
  29.  72
    Fine Tuning Can Be Important.John Leslie - 1994 - Australasian Journal of Philosophy 72 (3):383.
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  30.  26
    The Theory That the World Exists Because It Should.John Leslie - 1970 - American Philosophical Quarterly 7 (4):286 - 298.
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  31.  25
    The World's Necessary Existence.John Leslie - 1980 - International Journal for Philosophy of Religion 11 (4):207 - 224.
  32.  12
    Mackie on Neoplatonism's 'Replacement for God'.John Leslie - 1986 - Religious Studies 22 (3/4):325 - 342.
    David Hume's greatness depends in large part on how his writings hint at beautiful and coherent theories which are recognizably Humean despite their divergences from the untidy originals. Now, perhaps the clearest vision of a contradiction–free Platonic Form of Hume was had by J. L. Mackie; he described it in such masterpieces as The Cement of the Universe, Ethics: Inventing Right and Wrong, and The Miracle of Theism. How successful is this last in its attack on theism? I shall discuss (...)
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  33. Physics, Philosophy, and Theology: A Common Quest for Understanding.John Leslie - 1997 - Vatican Observatory.
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  34.  63
    Infinitely Long Afterlives and the Doomsday Argument.John Leslie - 2008 - Philosophy 83 (4):519-524.
    A recent book of mine defends three distinct varieties of immortality. One of them is an infinitely lengthy afterlife; however, any hopes of it might seem destroyed by something like Brandon Carter's 'doomsday argument' against viewing ourselves as extremely early humans. The apparent difficulty might be overcome in two ways. First, if the world is non-deterministic then anything on the lines of the doomsday argument may prove unable to deliver a strongly pessimistic conclusion. Secondly, anything on those lines may break (...)
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  35.  20
    Przejawy delikatnego dostrojenia.John Leslie - 1994 - Zagadnienia Filozoficzne W Nauce 16.
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  36.  17
    A Difficulty for Everett's Many-Worlds Theory.John Leslie - 1996 - International Studies in the Philosophy of Science 10 (3):239 – 246.
    Abstract An argument originated by Brandon Carter presents humankind's imminent extinction as likelier than we should otherwise have judged. We ought to be reluctant to think ourselves among the earliest 0.01 %, for instance, of all humans who will ever have lived; yet we should be in that tiny group if the human race survived long, even at just its present size. While such reasoning attracts many criticisms, perhaps the only grave one is that indeterminism means there is not yet (...)
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  37.  40
    The Reality of the Future.John Leslie - 1990 - Dialogue 29 (03):441-.
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  38.  28
    Ethically Required Existence.John Leslie - 1972 - American Philosophical Quarterly 9 (3):215 - 224.
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  39.  37
    A Cosmos Existing Through Ethical Necessity.John Leslie - 2009 - Philo 12 (2):172-187.
    The paper develops a Platonic and Spinozistic metaphysics. With an unprovable yet absolute necessity, the cosmos exists just because of the ethical need for it. We, and all the intricate structures of our universe, exist as intricately structured thoughts in a divine mind. This mind could contain infinitely many other universes as well, and minds of the same kind could exist in infinite number. Evidence for this is supplied by the finely tuned orderliness of our universe, and by the sheer (...)
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  40.  39
    Why Not Let Life Become Extinct?John Leslie - 1983 - Philosophy 58 (225):329 - 338.
    Would Earth be sadly underpopulated if all life on it had died? I shall argue for a Yes, against two main groups. In the first are those who say that life's absence could not be sad, a pity, something less than ideal, because there would be nobody to be sad about it. The second group maintains that life's absence would be preferable to its presence since living can be nasty.
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  41. Physical Cosmology and Philosophy.John Leslie - 1990
  42.  10
    Demons, Vats and the Cosmos.John Leslie - 1989 - Philosophical Papers 18 (2):169-188.
  43.  11
    Axiogenesis: An Essay in Metaphysical Optimalism. [REVIEW]John Leslie - 2011 - Review of Metaphysics 65 (2):441-443.
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  44.  31
    Book Review:The Riddle of Existence: An Essay in Idealistic Metaphysics Nicholas Rescher. [REVIEW]John Leslie - 1985 - Philosophy of Science 52 (3):485-.
  45.  17
    Axiogenesis.John Leslie - 2011 - Review of Metaphysics 65 (2):441-443.
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  46.  10
    The Value of Time.John Leslie - 1976 - American Philosophical Quarterly 13 (2):109 - 121.
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  47.  3
    John Leslie, Maryvonne Longeart-Roth, Rainer Friedrich, Celina A. Lertora Mendoza.John Leslie, Maryvonne Longeart-Roth, Rainer Friedrich & Celina A. Lertora Mendoza - 1988 - Philosophie Et Culture: Actes du XVIIe Congrès Mondial de Philosophie 5:616-617.
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  48.  11
    Does Causal Regularity Defy Chance?John Leslie - 1973 - Idealistic Studies 3 (3):277-284.
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  49.  7
    Apq Library of Philosophy.Brian Ellis, Hugh Lehman, Nicholas Rescher & John Leslie - 1977 - Verifiche: Rivista Trimestrale di Scienze Umane 6 (2).
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  50.  10
    The Divine Mind.John Leslie - 2000 - Royal Institute of Philosophy Supplement 47:73-89.
    By ‘a blank’, let us mean a situation including no actual existents: nothing beyond such platonic realities as that three groups of five apples, were there to exist such groups, would contain fifteen apples in total. Now, why is there a world and not a blank?
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