| 21. | Is satisfied by all surfaces of nonpositive Euler characteristic is unknown.
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| 22. | It was Leonhard Euler who fully incorporated complex numbers into trigonometry.
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| 23. | When h = 1, Euler gamma is what it is.
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| 24. | :It seems that Euler spirals have five degrees of freedom.
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| 25. | The basic invariant of an oriented bundle is the Euler class.
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| 26. | They were Daniel Bernoulli, Leonhard Euler, and Colin Maclaurin.
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| 27. | Moffatt was not the only scientist intrigued by Euler's disc.
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| 28. | Bernoulli numbers can be expressed through the Euler numbers and vice versa.
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| 29. | Euler also suggested that the complex logarithms can have infinitely many values.
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| 30. | An isomorphism is given by ( see Euler's identity ).
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