Let
e7e0dc6f9c83" title="Click to view the MathML source">L(X) be the algebra of all bounded linear operators on a complex Banach space
X. We describe surjective linear maps
ϕ on
e7e0dc6f9c83" title="Click to view the MathML source">L(X) that satisfy
for every
e80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈X and
bd335f84309015" title="Click to view the MathML source">T∈L(X). We also describe surjective linear maps
ϕ on
e7e0dc6f9c83" title="Click to view the MathML source">L(X) that satisfy
for every
e80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈X and
bd335f84309015" title="Click to view the MathML source">T∈L(X). Furthermore, we characterize maps
ϕ (not necessarily linear nor surjective) on
e7e0dc6f9c83" title="Click to view the MathML source">L(X) which satisfy
for every
e80a5bf6f8136a953e91f47a14f0" title="Click to view the MathML source">x∈X and
e88db17bf407ac2ea" title="Click to view the MathML source">T,S∈L(X).