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Vít Kotačka
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The Joy Of X: A Guided Tour of Math, from One to Infinity, by Steven H. Strogatz

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So multiplying by i produces a rotation counterclockwise by a quarter turn. It takes an arrow of length 3 pointing east and changes it into a new arrow of the same length but now pointing north.
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The Joy Of X: A Guided Tour of Math, from One to Infinity
The Joy Of X: A Guided Tour of Math, from One to Infinity
by Steven H. Strogatz
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