The range and kernel inclusion of algebraic derivations and commuting maps
ar *
Department of Mathematics, University of Maribor, PEF, Koro
ka 160, 2000 Maribor, Slovenia
Let
and
' be derivations of an algebra A. Consider the following conditions: (i) the range of
' is contained in the range of
, (ii) the kernel of
is contained in the kernel of
', (iii)
is an inner derivation generated by a
A and
' is an inner derivation generated by a polynomial in a. If
is algebraic then we show that under rather mild additional assumptions these three conditions are closely related. This is used in obtaining some new characterizations of commuting maps on certain rings and normed algebras.
Received 27 March 2003.