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  2. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function.

  3. Mathematical logic - Wikipedia

    en.wikipedia.org/wiki/Mathematical_logic

    Mathematical logic is the study of formal logic within mathematics.Major subareas include model theory, proof theory, set theory, and recursion theory (also known as computability theory).

  4. List of most expensive paintings - Wikipedia

    en.wikipedia.org/wiki/List_of_most_expensive...

    Salvator Mundi by Italian artist Leonardo da Vinci (c. 1500). This is a list of the highest known prices paid for paintings.The record is approximately US$450.3 million (which includes commission), paid for Leonardo da Vinci's Salvator Mundi (c. 1500).