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Note: Around the diagram for the green geometry has one of the "green squares" incorrectly drawnthe one with area 18 --it too should be a parallelogram.
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Intro to three-fold symmetry in planar geometry
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Quadrance between points
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Pythagoras and Triple quad formula
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Spread between lines
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Spread as a normalized squared determinant
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Laws of affine rational trigonometry
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Thales' theorem
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Proof of Cross law
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Blue Pythagoras
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Red Pythagoras
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Green Pythagoras
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Coloured altitudes
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Blue Euler line
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Red Euler line
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Green Euler line
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Omega triangle
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Omega triangle and more
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Blue ellipse and its diagonals
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Red ellipse
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Green ellipse and diagonals
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Three sets of foci and directrices
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A chromatic parabola
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References
Description:
Explore a groundbreaking lecture on chromogeometry, a revolutionary approach that unifies Euclidean and relativistic geometries to transform our understanding of planar geometry. Delve into the foundations of Rational Trigonometry and discover three fundamental planar metrical geometries. Examine the generalization of concepts like Euler lines, orthocenters, and circumcenters, culminating in the innovative Omega triangle. Investigate a novel perspective on conic sections, including the introduction of ellipse diagonals and chromogeometric aspects of ellipses and parabolas. Gain insights into the power of rational thinking in mathematics, challenging traditional notions of infinite sums and real numbers. Follow along as the lecture progresses through topics such as quadrance, spread, Pythagoras theorems in different geometries, colored altitudes, Euler lines, and chromatic parabolas. Witness how this new approach to geometry transcends Klein's Erlangen Program and opens doors to exciting mathematical discoveries. Read more

How Chromogeometry Transcends Klein's Erlangen Program for Planar Geometries - N J Wildberger

Insights into Mathematics
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