$$\label{eq: Strich inhom b}
    \normQRP{W(t)F}{\infty}{r}{p} \lesssim \normQRP{F}{\tilde q', p}{\tilde r'}{\tilde p'}.$$ Whenever $\tilde q' \leq p$ (\[eq: Strich inhom b\]) implies (\[eq: Strich inhom\]).

Conversely, if estimate (\[eq: Strich inhom\]) holds for all $F \in \spaceLqrpd$ in some dimension $n>1$, then $\trip$ and $\tript$ must be two jointly KT-acceptable exponent triplets.

Apparently, theorem \[thm: infty case\] leaves open the existence of some inhomogeneous estimates in $n>1$. The analogous estimates for the equation are posed as unresolved in Foschi [@F]\[section Open Questions\]. The latter work addressed the observation by Keel and Tao [@KT] (and others) that the full range of validity of the inhomogeneous Strichartz estimates for a given dispersive equation is larger than the set of those that correspond to admissible exponent pairs (triplets) only. We hope that our results could be beneficial to the general question by providing a perspective to a specific context.

\[thm: Strich admiss mix\] Suppose that $\qtet$ is a mixed KT-admissible exponent 5-tuple. Then the estimate $$\label{eq: Strich hom mix}
\normQRP{U(t)f}{q,c}{r}{p} \lesssim \normBC{f}{b}{c}$$ holds for all $f \in L^b_xL^c_v$. Conversely, if estimate (\[eq: Strich hom mix\]) [^3] holds for all $f \in L^b_xL^c_v$, then $\qtet$ must be a mixed KT-admissible exponent 5-tuple.[^4]

The appearance of 