Public announcements are used in dynamic epistemic logic to model certain kinds of information change. A formula 〈ψ〉φ represents the statement that after ψ is publicly announced φ will be the case. Sometimes we want to reason about whether it is possible for φ to become true after some announcement. In order to do this an arbitrary public announcement operator ♦ can be added to an epistemic log...

ion we need, since it is clearly a property of the SAF F itself and not of any particular model based on F . This notion of validity stems from the semantics of modal logic, in which the same distinction is made between satisfaction of a formula φ as a property of models, and validity as a property of some underlying “frame”. Therefore we will look at SAFs as a variant of such modal frames. In ...

For two real characters ψ, ψ of conductor dividing 8 define Z(s,w;ψ, ψ′) := ζ2(2s+ 2w − 1) X d odd L2(s, χdψ)ψ (d) dw where χd = “

The decays ψ2(3823)→γχc0,1,2, π+π−J/ψ, π0π0J/ψ, ηJ/ψ, and π0J/ψ are searched for using the reaction e+e−→π+π−ψ2(3823) in a 19 fb−1 data sample collected at center-of-mass energies between 4.1 4.7 GeV with BESIII detector. process ψ2(3823)→γχc1 is observed 9 energy range 4.3–4.7 GeV, which confirms previous observation but higher significance of 11.8σ, evidence ψ2(3823)→γχc2 found 3.2σ first tim...

The recent BES Collaboration data on ψ ′ → P V , particularly the isospin violating mode ψ ′ → π 0 ω 0 and finding of a finite number for B(ψ ′ → K * 0 K 0), enable us now to deal more precisely about the challenges to theory concerning this extraordinary and remarkable so called ρ − π Puzzle of J/ψ and ψ ′ Decays. In terms of existing data, and deploying the simplest phenomenol-ogy, measuremen...