On maps preserving operators of local spectral radius zero
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Let de7e0dc6f9c83" title="Click to view the MathML source">L(X)den">de">L(X) be the algebra of all bounded linear operators on a complex Banach space X. We describe surjective linear maps ϕ   on de7e0dc6f9c83" title="Click to view the MathML source">L(X)den">de">L(X) that satisfy
e71dd86451d0" title="Click to view the MathML source">rϕ(T)(x)=0⟹rT(x)=0den">de">rϕ(T)(x)=0rT(x)=0
for every de80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈Xden">de">xX and T∈L(X)den">de">TL(X). We also describe surjective linear maps ϕ   on de7e0dc6f9c83" title="Click to view the MathML source">L(X)den">de">L(X) that satisfy
rT(x)=0⟹rϕ(T)(x)=0den">de">rT(x)=0rϕ(T)(x)=0
for every de80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈Xden">de">xX and T∈L(X)den">de">TL(X). Furthermore, we characterize maps ϕ   (not necessarily linear nor surjective) on de7e0dc6f9c83" title="Click to view the MathML source">L(X)den">de">L(X) which satisfy for every de80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈Xden">de">xX and de0891bade88db17bf407ac2ea" title="Click to view the MathML source">T,S∈L(X)den">de">T,SL(X).

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