“…In the current paper, we offer direct and self-contained proofs using techniques and basic results from commutative ring theory. Early and recent developments on prime spectra and dimension theory are to be found in [3,5,6,7,29,30,31,34,35] for the special case of tensor products of k-algebras, and in [1,11,17,22,24,26,27] for the general case. Any unreferenced material is standard, as in [24,26].…”