List questions from idempotents

Published on 10 May 2026 - 23:54

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Idempotent operators over the exterior algebra

Published on 14 Apr 2026 - 19:09

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Idempotent operators.

Published on 10 May 2026 - 8:19

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Given $P$ idempotent, show that $I-P$ is idempotent.

Published on 15 Apr 2026 - 19:15

1.6k

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Find all roots of $\,x^2\!\equiv x\pmod{\!900}$, i.e all idempotents in $\Bbb Z_{900}$

Published on 17 Apr 2026 - 6:25

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Families of Idempotent $3\times 3$ Matrices

Published on 13 Apr 2026 - 8:07

157

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Find an invertible non-diagonal $3 \times 3$ matrix $D$ such that $D^3 = D$.

Published on 16 Apr 2026 - 7:02

227

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Idempotents in quotient ring

Published on 15 Apr 2026 - 0:01

905

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Proving that a matrix is idempotent

Published on 11 Apr 2026 - 17:42

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Demonstrate that the centering matrix is idempotent

Published on 13 Apr 2026 - 11:19

175

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A counterexample to $Ae\simeq Ae^{\prime}\to A(1-e)\simeq A(1-e^{\prime})$

Published on 12 Apr 2026 - 0:35

817

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Idempotent and zero divisors

Published on 16 Apr 2026 - 21:34

186

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Suppose that $R$ is a commutative ring with unity, $a \in R$, and $\varphi(r) = ar$ defines a ring homomorphism. Prove that $a$ is idempotent.

Published on 14 Apr 2026 - 6:22

126

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Idempotent generators of the four binary QR codes of length 7

Published on 14 Apr 2026 - 10:37

1.3k

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Prove that in a finite monoid each element is invertible

Published on 16 Apr 2026 - 4:42

List Question

Relation between hyperbolic numbers and hyperbolic functions

Idempotent operators over the exterior algebra

Idempotent operators.

Given $P$ idempotent, show that $I-P$ is idempotent.

Find all roots of $\,x^2\!\equiv x\pmod{\!900}$, i.e all idempotents in $\Bbb Z_{900}$

Families of Idempotent $3\times 3$ Matrices

Find an invertible non-diagonal $3 \times 3$ matrix $D$ such that $D^3 = D$.

Idempotents in quotient ring

Proving that a matrix is idempotent

Demonstrate that the centering matrix is idempotent

A counterexample to $Ae\simeq Ae^{\prime}\to A(1-e)\simeq A(1-e^{\prime})$

Idempotent and zero divisors

Suppose that $R$ is a commutative ring with unity, $a \in R$, and $\varphi(r) = ar$ defines a ring homomorphism. Prove that $a$ is idempotent.

Idempotent generators of the four binary QR codes of length 7

Prove that in a finite monoid each element is invertible

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