Believe it or not - 9

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Dear all

Descartes (1596-1650) wrote his coordinate geometry without the use of negative numbers.

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πŸ…·πŸ…°πŸ…ΏπŸ…ΏπŸ†ˆ πŸ…ΏπŸ…Έ πŸ…³πŸ…°πŸ†ˆ

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