Imaginary unit
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Hermann Grassmann
Alfred North Whitehead
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Dual number
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August Ferdinand Möbius
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Josiah Willard Gibbs
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1809
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Yellow
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Euclidean vector
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Tensor
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September 26
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Peano axioms
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Polytope
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Natural number
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Linear algebra
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History of mathematics
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Geometric algebra
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History of geometry
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Edmund Husserl
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Euclidean geometry
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Comparative method
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Bra–ket notation
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April 15
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Hermann (name)
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Hermann Günther Grassmann
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Hermann Gunter Grassmann
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