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  2. Quantum mechanics of time travel - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics_of_time...

    In 1991, David Deutsch proposed a method to explain how quantum systems interact with closed timelike curves (CTCs) using time evolution equations. This method aims to address paradoxes like the grandfather paradox, [10] [11] which suggests that a time traveler who stops their own birth would create a contradiction.

  3. Square root - Wikipedia

    en.wikipedia.org/wiki/Square_root

    The square of any positive or negative number is positive, and the square of 0 is 0. Therefore, no negative number can have a real square root. However, it is possible to work with a more inclusive set of numbers, called the complex numbers, that does contain solutions to the square

  4. Novikov self-consistency principle - Wikipedia

    en.wikipedia.org/wiki/Novikov_self-consistency...

    Outer Wilds (2019): A video game involving time travel which does not follow the principle, causing a game over if the player experiments to test it. All time travel in the Hallmark Channel original series The Way Home follows the Novikov self-consistency principle. Two of the main characters can travel backwards in time by jumping into a pond ...

  5. Mathematical fallacy - Wikipedia

    en.wikipedia.org/wiki/Mathematical_fallacy

    The square root is multivalued. One value can be chosen by convention as the principal value; in the case of the square root the non-negative value is the principal value, but there is no guarantee that the square root given as the principal value of the square of a number will be equal to the original number (e.g. the principal square root of ...

  6. Galileo's paradox - Wikipedia

    en.wikipedia.org/wiki/Galileo's_paradox

    First, a square is an integer which is the square of an integer. Some numbers are squares, while others are not; therefore, all the numbers, including both squares and non-squares, must be more numerous than just the squares. And yet, for every number there is exactly one square; hence, there cannot be more of one than of the other.

  7. Scientists find evidence of ‘negative time’ - AOL

    www.aol.com/news/scientists-evidence-negative...

    The results were detailed in a study, titled ‘Experimental evidence that a photon can spend a negative amount of time in an atom cloud’, which is currently awaiting peer review.

  8. Airline Passenger Who Claimed Fellow Traveler Was ‘Not Real ...

    www.aol.com/lifestyle/airline-passenger-claimed...

    A Texas woman who went viral for delaying an American Airlines flight last month while sensationally yelling that another passenger onboard was “not real” has issued an apology saying her ...

  9. List of paradoxes - Wikipedia

    en.wikipedia.org/wiki/List_of_paradoxes

    Paradox of free will: If God knows in advance what a person will decide, how can there be free will? Goodman's paradox : Why can induction be used to confirm that things are "green", but not to confirm that things are "grue"?