# Jonathan J. Crabtree

• ### Multiplication II

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Jonathan J. Crabtree

• ### Baudhayana's Theorem extended to other regular shapes

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Jonathan J. Crabtree

• ### Indian Logic Meets Descartes' Multiplication Model

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Jonathan J. Crabtree

• ### Indian Logic Meets Descartes' Multiplication via www.podo.in

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Jonathan J. Crabtree

• ### Bharatiya Maths Multiplication on a Plane www.podometic.in

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Jonathan J. Crabtree

• ### DesCartesian Multiplication (via Bharatiya Maths)

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Jonathan J. Crabtree

• ### Baudhāyana Theorem

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Jonathan J. Crabtree

• ### Baudhāyana Theorem

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Jonathan J. Crabtree

• ### Baudhāyana Theorem works for circles as well as squares

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Jonathan J. Crabtree

• ### Sarah's Circle

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Jonathan J. Crabtree

• ### Multiplication with a Curve (the parabola y = x^2)

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Jonathan J. Crabtree

• ### Re-Directing Descartes' 1637 Multiplication Part 1

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Jonathan J. Crabtree

• ### DesCartesian Division

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Jonathan J. Crabtree

• ### Descartes' Multiplication Model

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Jonathan J. Crabtree

• ### Re-Directing Descartes' Definition of Multiplication.

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Jonathan J. Crabtree

• ### The Multiplication Table Triangle

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Jonathan J. Crabtree

• ### DesCartesian Division (via newton)

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Jonathan J. Crabtree

• ### Descartes' 1637 Multiplication Part 2

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Jonathan J. Crabtree

• ### A Corollary to Pythagoras' Theorem. a◯ + b◯ = c◯

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Jonathan J. Crabtree

• ### An Introduction to PCV (Proportional Co-Variation)

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Jonathan J. Crabtree

• ### How to Square a Circle With Rope

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Jonathan J. Crabtree

• ### Is the Fundamental Theorem of Algebra a mirage?

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Jonathan J. Crabtree

• ### Pythagoras' Zipper

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Jonathan J. Crabtree

• ### Thales, Roots and Similar Triangles

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Jonathan J. Crabtree