List questions from complex-numbers

Published on 16 Apr 2026 - 19:54

433

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Complex polarization identity proof getting stuck towards the end w.r.t. the imaginary part

Published on 12 Apr 2026 - 16:10

165

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Complex conjugations

Published on 11 Apr 2026 - 6:51

2.4k

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verify that the Fourier Transform of Impulse Train is another Impulse Train

Published on 11 Apr 2026 - 13:54

413

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A Polynomial Formed from the Roots of Another Polynomial ad infinitum

Published on 15 Apr 2026 - 0:18

119

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Solving for complex exponent

Published on 25 Mar 2026 - 21:53

70

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Closedness of a subset of complex numbers under addition

Published on 11 Apr 2026 - 12:10

92

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Proof $\mathbb{C}^* \cong \mathbb{C} / \mathbb{Z}$

Published on 09 Apr 2026 - 14:23

105

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Are the following functions positive definite?

Published on 11 Apr 2026 - 23:12

50

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Determining $\min\{|z-a|^2+|z-b|^2 \mid z\in \mathbb{C}\}$

Published on 13 Apr 2026 - 8:44

145

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What is $\cos x-\cos2x+\cos3x-\cos4x...\pm\cos(Nx)$?

Published on 25 Mar 2026 - 16:14

79

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Looking for an elegant proof for $e^{jn\pi} = (-1)^n e^{-jn\pi}$

Published on 11 Apr 2026 - 18:20

145

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Probability that $|z_1+z_2|\geq \sqrt{2+\sqrt 3}$

Published on 16 Apr 2026 - 7:22

79

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Find all complex numbers

Published on 13 Apr 2026 - 5:10

139

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why solution of a second order DE with complex roots does not work when tested?

Published on 09 Apr 2026 - 19:13

List Question

Determining $\arg(u-\sqrt{3})$ in exact form.

Complex polarization identity proof getting stuck towards the end w.r.t. the imaginary part

Complex conjugations

verify that the Fourier Transform of Impulse Train is another Impulse Train

A Polynomial Formed from the Roots of Another Polynomial ad infinitum

Solving for complex exponent

Closedness of a subset of complex numbers under addition

Proof $\mathbb{C}^* \cong \mathbb{C} / \mathbb{Z}$

Are the following functions positive definite?

Determining $\min\{|z-a|^2+|z-b|^2 \mid z\in \mathbb{C}\}$

What is $\cos x-\cos2x+\cos3x-\cos4x...\pm\cos(Nx)$?

Looking for an elegant proof for $e^{jn\pi} = (-1)^n e^{-jn\pi}$

Probability that $|z_1+z_2|\geq \sqrt{2+\sqrt 3}$

Find all complex numbers

why solution of a second order DE with complex roots does not work when tested?

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