List questions from idempotents

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What is the set {$e\in(R/ I)\times(R/J): e$ is idempotent}

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The idempotent elements of Eisenstein Integers

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Prove that $A-I_n$ is idempotent

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Idempotent substitution $\theta$

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Relations of structures related to conjugate idempotents

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Composition series of regular module

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Is $A^3=A$ a condition for idempotency of matrices?

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Is it true that $X(X'X)^{-1}X'-J/n$ is idempotent, where $J$ is an $n$ by $n$ matrix of ones?

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Idempotents over a ring with zero divisors

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Proving lemma about centrality of idempotent elements in a Ring with no nilpotent elements.

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Must an idempotent matrix be symmetric?

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Proof: Show that $A^2=A$ is diagonalizable

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Do you know if eigenvectors of idempotent matrices are always orthonormal?

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Idempotent endomorphisms on $\mathbb{Z}\times \mathbb{Z}$

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List Question

Prove that an idempotent element must be either 0, 1 or a zero-divisor.

What is the set {$e\in(R/ I)\times(R/J): e$ is idempotent}

The idempotent elements of Eisenstein Integers

Prove that $A-I_n$ is idempotent

Idempotent substitution $\theta$

Relations of structures related to conjugate idempotents

Composition series of regular module

Is $A^3=A$ a condition for idempotency of matrices?

Is it true that $X(X'X)^{-1}X'-J/n$ is idempotent, where $J$ is an $n$ by $n$ matrix of ones?

Idempotents over a ring with zero divisors

Proving lemma about centrality of idempotent elements in a Ring with no nilpotent elements.

Must an idempotent matrix be symmetric?

Proof: Show that $A^2=A$ is diagonalizable

Do you know if eigenvectors of idempotent matrices are always orthonormal?

Idempotent endomorphisms on $\mathbb{Z}\times \mathbb{Z}$

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