Necessary/sufficient conditions in weighted theory
arXiv:2009.12091
Abstract
We provide an essentially complete dictionary of all implications among the basic and fundamental conditions in weighted theory such as the doubling, one weight A_p(w), A_\infty and C_p conditions as well as the two weight A_p and the "buffer" Energy and Pivotal conditions. The most notable implication is that in the case of A_\infty weights the two weight A_p condition implies the p-Pivotal condition hence giving an elegant and short proof of the known NTV-conjecture with p=2 for A_\infty weights in terms of existing T1 theory. We also provide a quite technical construction inspired by [6] proving that we can have doubling weights satisfying the C_p condition which are not in A_\infty.