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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent. With the bent hypotenuse, the first figure actually occupies a combined 32 units, while the second figure occupies 33, including the "missing" square.

  3. Staircase paradox - Wikipedia

    en.wikipedia.org/wiki/Staircase_paradox

    In mathematical analysis, the staircase paradox is a pathological example showing that limits of curves do not necessarily preserve their length. [1] It consists of a sequence of "staircase" polygonal chains in a unit square , formed from horizontal and vertical line segments of decreasing length, so that these staircases converge uniformly to ...

  4. Hooper's paradox - Wikipedia

    en.wikipedia.org/wiki/Hooper's_paradox

    Hooper's paradox is a falsidical paradox based on an optical illusion. A geometric shape with an area of 32 units is dissected into four parts, which afterwards get assembled into a rectangle with an area of only 30 units.

  5. List of paradoxes - Wikipedia

    en.wikipedia.org/wiki/List_of_paradoxes

    This is the canonical self-referential paradox. Also "Is the answer to this question 'no'?", and "I'm lying." Card paradox: "The next statement is true. The previous statement is false." A variant of the liar paradox in which neither of the sentences employs (direct) self-reference, instead this is a case of circular reference.

  6. Gabriel's horn - Wikipedia

    en.wikipedia.org/wiki/Gabriel's_horn

    The apparent paradox formed part of a dispute over the nature of infinity involving many of the key thinkers of the time, including Thomas Hobbes, John Wallis, and Galileo Galilei. [12] The analogue of Gabriel's horn in two dimensions has an area of 2 but infinite perimeter. There is a similar phenomenon that applies to lengths and areas in the ...

  7. Ant on a rubber rope - Wikipedia

    en.wikipedia.org/wiki/Ant_on_a_rubber_rope

    A key observation is that the speed of the ant at a given time > is its speed relative to the rope, i.e. , plus the speed of the rope at the point where the ant is. The target-point moves with speed v {\displaystyle v} , so at time t {\displaystyle t} it is at x = c + v t {\displaystyle x=c+vt} .

  8. Jules Richard (mathematician) - Wikipedia

    en.wikipedia.org/wiki/Jules_Richard_(mathematician)

    In a more philosophical treatise about the nature of axioms of geometry Richard discusses and rejects the following basic principles: Geometry is founded on arbitrarily chosen axioms - there are infinitely many equally true geometries. Experience provides the axioms of geometry, the basis is experimental, the development deductive.

  9. Aristotle's wheel paradox - Wikipedia

    en.wikipedia.org/wiki/Aristotle's_wheel_paradox

    Aristotle's wheel paradox is a paradox or problem appearing in the pseudo-Aristotelian Greek work Mechanica. It states as follows: A wheel is depicted in two-dimensional space as two circles . Its larger, outer circle is tangential to a horizontal surface (e.g. a road that it rolls on), while the smaller, inner one has the same center and is ...

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