All Videos Channels
  1. Deriving Ceva's theorem from Menelaus's theorem | plane geometry | intermediate level

    Deriving Ceva's theorem from Menelaus's theorem | plane geometry | intermediate level

    15
  2. Logarithmic derivative | mathematical analysis | advanced level

    Logarithmic derivative | mathematical analysis | advanced level

    16
    1
  3. Brocard points of a triangle | plane geometry | intermediate level

    Brocard points of a triangle | plane geometry | intermediate level

    4
    1
  4. Deriving Menelaus's theorem from Ceva's theorem | plane geometry | intermediate level

    Deriving Menelaus's theorem from Ceva's theorem | plane geometry | intermediate level

    34
  5. The second Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    The second Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    17
  8. The proof of Napoleon's theorem using rotational homothety | plane geometry | advanced level

    The proof of Napoleon's theorem using rotational homothety | plane geometry | advanced level

    34
    2
  10. Extending the arithmetic derivative to negative numbers | number theory | advanced level

    Extending the arithmetic derivative to negative numbers | number theory | advanced level

    25
    1
  11. The sum of angles of a triangle | plane geometry | elementary level

    The sum of angles of a triangle | plane geometry | elementary level

    42
    1
  12. The first Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    The first Fermat-Torricelli point of a triangle | plane geometry | intermediate level

    18
  13. Arithmetic logarithmic derivative | number theory | advanced level

    Arithmetic logarithmic derivative | number theory | advanced level

    17
  14. The set of integer numbers is countable | set theory | elementary level

    The set of integer numbers is countable | set theory | elementary level

    8
  16. A median in a right triangle | plane geometry | elementary level

    A median in a right triangle | plane geometry | elementary level

    4
  17. The nine-point circle and the Euler line | plane geometry | advanced level

    The nine-point circle and the Euler line | plane geometry | advanced level

    16
  18. The set of rational numbers is countable | set theory | elementary level

    The set of rational numbers is countable | set theory | elementary level

    5
  21. Van Aubel's theorem about cevians | plane geometry | intermediate level

    Van Aubel's theorem about cevians | plane geometry | intermediate level

    31
    2
  22. The sum of angles of a polygon | plane geometry | intermediate level

    The sum of angles of a polygon | plane geometry | intermediate level

    11
  23. Lagrange's mean value theorem | mathematical analysis | elementary level

    Lagrange's mean value theorem | mathematical analysis | elementary level

    14
  25. Arithmetic derivative: an introduction | number theory | advanced level

    Arithmetic derivative: an introduction | number theory | advanced level

    13