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  2. Ethical dilemma - Wikipedia

    en.wikipedia.org/wiki/Ethical_dilemma

    Ethical dilemmas come in various types. An important distinction concerns the difference between epistemic dilemmas, which give a possibly false impression to the agent of an unresolvable conflict, and actual or ontological dilemmas. There is broad agreement that there are epistemic dilemmas but the main interest in ethical dilemmas takes place ...

  3. Existential crisis - Wikipedia

    en.wikipedia.org/wiki/Existential_crisis

    In psychology and psychotherapy, the term "existential crisis" refers to a form of inner conflict.It is characterized by the impression that life lacks meaning and is accompanied by various negative experiences, such as stress, anxiety, despair, and depression.

  4. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities.

  5. Halting problem - Wikipedia

    en.wikipedia.org/wiki/Halting_problem

    A key part of the formal statement of the problem is a mathematical definition of a computer and program, usually via a Turing machine. The proof then shows, for any program f that might determine whether programs halt, that a "pathological" program g exists for which f makes an incorrect determination.

  6. Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Thesaurus

    A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms.

  7. Solipsism - Wikipedia

    en.wikipedia.org/wiki/Solipsism

    Solipsism (/ ˈ s ɒ l ɪ p s ɪ z əm / ⓘ SOLL-ip-siz-əm; from Latin solus 'alone' and ipse 'self') [1] is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.

  8. Synonym - Wikipedia

    en.wikipedia.org/wiki/Synonym

    A synonym is a word, morpheme, or phrase that means precisely or nearly the same as another word, morpheme, or phrase in a given language. [2] For example, in the English language , the words begin , start , commence , and initiate are all synonyms of one another: they are synonymous .

  9. Circular reference - Wikipedia

    en.wikipedia.org/wiki/Circular_reference

    is circular, but not without meaning. Indeed, it can be argued that self-reference is a necessary consequence of Aristotle's Law of non-contradiction, a fundamental philosophical axiom. In this view, without self-reference, logic and mathematics become impossible, or at least, lack usefulness. [2] [3]