Explaining, convincing and proving

  • Mind your \Ps and \Qs
    problem

    Mind your Ps and Qs

    Age
    16 to 18
    Challenge level
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    Sort these mathematical propositions into a series of 8 correct statements.

  • Farey Neighbours
    problem

    Farey neighbours

    Age
    16 to 18
    Challenge level
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    Farey sequences are lists of fractions in ascending order of magnitude. Can you prove that in every Farey sequence there is a special relationship between Farey neighbours?

  • The clue is in the question
    problem

    The clue is in the question

    Age
    16 to 18
    Challenge level
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    Starting with one of the mini-challenges, how many of the other mini-challenges will you invent for yourself?
  • Matrix meaning
    problem

    Matrix meaning

    Age
    16 to 18
    Challenge level
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    Explore the meaning behind the algebra and geometry of matrices with these 10 individual problems.

  • Top marks
    problem

    Top marks

    Age
    16 to 18
    Challenge level
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    Can you make all of these statements about averages true at the same time?

  • Particularly general
    problem

    Particularly general

    Age
    16 to 18
    Challenge level
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    By proving these particular identities, prove the existence of general cases.
  • Amicable Arrangements
    problem

    Amicable arrangements

    Age
    16 to 18
    Challenge level
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    Three of Santa's elves and their best friends are sitting down to a festive feast. Can you find the probability that each elf sits next to their bestie?

  • Rational Round
    problem

    Rational round

    Age
    16 to 18
    Challenge level
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    Show that there are infinitely many rational points on the unit circle and no rational points on the circle x^2+y^2=3.
  • Pythagoras for a Tetrahedron
    problem

    Pythagoras for a tetrahedron

    Age
    16 to 18
    Challenge level
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    In a right-angled tetrahedron prove that the sum of the squares of the areas of the 3 faces in mutually perpendicular planes equals the square of the area of the sloping face. A generalisation of Pythagoras' Theorem.