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## Main Question or Discussion Point

I'm trying to teach myself math for physics (a middle aged physicist wannabee). Wikipedia's proof for the exisitence of a JC form for matrix A in Cn,n states:

"The range of A − λ I, denoted by , is an invariant subspace of A"

I'm having trouble seeing why any element of Ran(A − λ I) is in the range also of A.

Also, where can I find instructions on putting equations in this forum?

Thankyou!

Ken C.

"The range of A − λ I, denoted by , is an invariant subspace of A"

I'm having trouble seeing why any element of Ran(A − λ I) is in the range also of A.

Also, where can I find instructions on putting equations in this forum?

Thankyou!

Ken C.