  Sufficient conditions for performing changes of the variable of integration
when using the new definitions of improper integrals given in in "An
Alternative Definition for Improper Integral with Infinite Limit"
(arXiv:0805.3559v1) and "An Alternative Definition for Improper Integral with
Finite Limits" (arXiv:0810.4654v1) are presented. These changes of variable are
valid when both the initial and final integrals exist. In general, the
existence of one of the integrals does not guarantee the existence of the
other. In a restricted set of changes of variable, the existence of either
integral guarantees existence of the other.
