List questions from idempotents

Published on 25 Mar 2026 - 16:06

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Idempotent operators over the exterior algebra

Published on 18 Jun 2014 - 17:13

806

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Idempotent operators.

Published on 01 Jul 2014 - 14:35

2.1k

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

Published on 12 Aug 2014 - 3:53

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 18 Aug 2014 - 14:59

1.6k

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Families of Idempotent $3\times 3$ Matrices

Published on 18 Aug 2014 - 22:10

154

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

Published on 24 Aug 2014 - 23:01

224

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Idempotents in quotient ring

Published on 12 Sep 2014 - 19:36

903

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Proving that a matrix is idempotent

Published on 20 Sep 2014 - 20:11

2.8k

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Demonstrate that the centering matrix is idempotent

Published on 01 Oct 2014 - 19:50

173

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

Published on 25 Mar 2026 - 7:48

812

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Idempotent and zero divisors

Published on 17 Nov 2014 - 20:57

183

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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 25 Nov 2014 - 18:50

123

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Idempotent generators of the four binary QR codes of length 7

Published on 27 Nov 2014 - 0:46

1.3k

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Prove that in a finite monoid each element is invertible

Published on 25 Mar 2026 - 14:22

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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