Mathematics insights presented through animations, formulas, pictures, graphics, quotes, books, history, and memes. Open DM.
Shorts
Solving a Rubik's Cube with graph theory.
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“Philosophy is written in this grand book, the universe, which stands continually open before our eyes… It is written in the language of mathematics.” - Galileo Galilei
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Every conic is a slice of the same cone.
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Rotation matrices at work.
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Sine and Cosine waves are...nothing but the shadows of a spinning circle.
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(a + b + c)² = a² + b² + c² + 2(ab + ac + bc)
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Pythagorean theorem, written on the unit circle: sin²θ + cos²θ = 1.
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Unrolling Euler's Formula.
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The Geometry of Integration by Parts.
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a³−b³ = (a−b)(a²+ab+b²)
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Three golden rectangles, set mutually perpendicular, quietly define a regular icosahedron. Their twelve corners are exactly its twelve vertices.
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You Can Watch Euler's Formula, Unrolled.
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Rotation Matrices in Motion.
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A plane sliding through a double cone traces every conic section.
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Viviani’s theorem demonstrates spatial conservation, showing that the three perpendicular lines behave like a zero-sum game: moving closer to one side requires corresponding movement away from the other two. Local changes maintain a global constant.
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At any point on a curve, there's one circle that fits the curve better than any other. It touches the curve at that point, leans in the same direction, and bends by the same amount. It tells you how sharply the curve is bending at that exact spot, and which way it's leaning. If the curve is bending sharply, the circle is small. If the curve is nearly straight, the circle is huge. The osculating circle of the curve.
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The Beautiful Gaussian Integral.
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The distance a circle travels in a single revolution without slipping equals π times its diameter, regardless of the wheel's size.
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The Hidden Geometry of Trigonometric Functions and the Unit Circle.