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  2. Yes–no question - Wikipedia

    en.wikipedia.org/wiki/Yes–no_question

    In linguistics, a yesno question, also known as a binary question, a polar question, or a general question, [1] or closed-ended question is a question whose expected answer is one of two choices, one that provides an affirmative answer to the question versus one that provides a negative answer to the question.

  3. Question - Wikipedia

    en.wikipedia.org/wiki/Question

    Questions come in a number of varieties. For instance; Polar questions are those such as the English example "Is this a polar question?", which can be answered with "yes" or "no". Alternative questions such as "Is this a polar question, or an alternative question?" present a list of possibilities to choose from.

  4. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    RNA folding problem: Is it possible to accurately predict the secondary, tertiary and quaternary structure of a polyribonucleic acid sequence based on its sequence and environment? Protein design : Is it possible to design highly active enzymes de novo for any desired reaction?

  5. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The question is whether or not, for all problems for which an algorithm can verify a given solution quickly (that is, in polynomial time), an algorithm can also find that solution quickly. Since the former describes the class of problems termed NP, while the latter describes P, the question is equivalent to asking whether all problems in NP are ...

  6. Decision problem - Wikipedia

    en.wikipedia.org/wiki/Decision_problem

    A decision problem is a yes-or-no question on an infinite set of inputs. It is traditional to define the decision problem as the set of possible inputs together with the set of inputs for which the answer is yes. [1] These inputs can be natural numbers, but can also be values of some other kind, like binary strings or strings over some other ...

  7. Echo answer - Wikipedia

    en.wikipedia.org/wiki/Echo_answer

    Generally, with the exception of certain situational words, Nepali employs echo answers to respond to yes-no questions. The words "yes" and "no" in English are most commonly translated as 'हो' (ho; lit. ' "is" ') and 'होइन' (hoina; lit. ' "not is" ') are in fact the affirmative and negative forms of the same verb 'हो' (ho; lit ...

  8. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    The 6th problem concerns the axiomatization of physics, a goal that 20th-century developments seem to render both more remote and less important than in Hilbert's time. Also, the 4th problem concerns the foundations of geometry, in a manner that is now generally judged to be too vague to enable a definitive answer.

  9. Entscheidungsproblem - Wikipedia

    en.wikipedia.org/wiki/Entscheidungsproblem

    By the completeness theorem of first-order logic, a statement is universally valid if and only if it can be deduced using logical rules and axioms, so the Entscheidungsproblem can also be viewed as asking for an algorithm to decide whether a given statement is provable using the rules of logic.