List questions from idempotents

Published on 17 Apr 2026 - 5:02

82

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If $e^2 = e$ in a ring $R$ [not necessarily commutative], then $Re$ is an ideal iff $eR(1-e) = 0$

Published on 16 Apr 2026 - 15:50

181

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Idempotent automorphisms

Published on 10 Apr 2026 - 17:18

433

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The only idempotent element in $\Bbb Z_{51}$ are $0$ and $1$.

Published on 15 Apr 2026 - 0:59

130

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Finite Boolean ring with $1 \neq 0$ is isomorphic to $\mathbb{Z}_2\times \mathbb{Z}_2 \times \dots \times \mathbb{Z}_2$

Published on 10 May 2026 - 16:36

69

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If $e_1,\dots,e_n\in R$ are idempotent then $\langle e_1,\dots,e_n\rangle=\langle d\rangle$ for some idempotent $d\in R$

Published on 16 Apr 2026 - 3:26

152

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Local idempotents in a von Neumann regular rings

Published on 14 Apr 2026 - 8:19

83

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Idempotent elements in modulo n ring that is "split" in at least two other rings

Published on 16 Apr 2026 - 21:34

905

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Constructing a centrally primitive idempotent in the group algebra of the symmetric group

Published on 10 May 2026 - 12:54

55

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Non-prime power idempotents

Published on 14 Apr 2026 - 19:06

114

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G-inverse and idempotent

Published on 16 Apr 2026 - 7:50

129

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Is there a nilpotent and idempotent pair such that their product is the identity matrix?

Published on 11 Apr 2026 - 10:54

666

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Square Idempotent matrix: efficient algorithms for finding eigenvectors

Published on 11 Apr 2026 - 8:49

942

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Idempotent Elements of a Commutative Ring

Published on 15 Apr 2026 - 21:50

2.7k

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Ring with non-trivial idempotent splitting as product of two rings

Published on 08 Apr 2026 - 22:57

List Question

Idempotent elements in a modulo n ring

If $e^2 = e$ in a ring $R$ [not necessarily commutative], then $Re$ is an ideal iff $eR(1-e) = 0$

Idempotent automorphisms

The only idempotent element in $\Bbb Z_{51}$ are $0$ and $1$.

Finite Boolean ring with $1 \neq 0$ is isomorphic to $\mathbb{Z}_2\times \mathbb{Z}_2 \times \dots \times \mathbb{Z}_2$

If $e_1,\dots,e_n\in R$ are idempotent then $\langle e_1,\dots,e_n\rangle=\langle d\rangle$ for some idempotent $d\in R$

Local idempotents in a von Neumann regular rings

Idempotent elements in modulo n ring that is "split" in at least two other rings

Constructing a centrally primitive idempotent in the group algebra of the symmetric group

Non-prime power idempotents

G-inverse and idempotent

Is there a nilpotent and idempotent pair such that their product is the identity matrix?

Square Idempotent matrix: efficient algorithms for finding eigenvectors

Idempotent Elements of a Commutative Ring

Ring with non-trivial idempotent splitting as product of two rings

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