Here is a list of some of the most important mathematical concepts, in no particular order:

    Numbers and arithmetic operations (addition, subtraction, multiplication, division)
    Algebraic expressions and equations
    Geometry (points, lines, shapes, angles, areas, volumes)
    Trigonometry
    Calculus (derivatives, integrals, limits)
    Probability and statistics
    Set theory and relations
    Matrix algebra and linear transformations
    Graph theory
    Number theory

Note: Importance and relevance of mathematical concepts can vary depending on the field or subject being studied.
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