Matters are exactly the same for necessity claims, but these instead make a claim about what is true at all accessible worlds.
Instead of rigidity, consider the weaker notion called local rigidity in Fitting and Mendelsohn 1998: an intension is locally rigid at a state if it has the same designation at that state that it has at all accessible ones.
\ \Box X\), that is, necessarily \(X\), is true at a state if \(X\) itself is true at every state that is relevant to that state (at all accessible states).
In addition to making your travel plans easily available, Easythingy puts bills, receipts, confirmation emails and even deliveries at your fingertips, all accessible through the app's neat and simple interface.
Then there is the "2000 Biennial" exhibition at the Whitney Museum of American Art, featuring nine Web sites, many of them interactive and all accessible at www.whitney.org.org
Mr. Zeitlin said the idea behind the site is to create "a wonderful living archive of the city where the stories and voices and faces of New York are all accessible at a click".
While an average-size record store can hold roughly 25,000 titles, and a megastore, 80,000, these virtual record marts, because they buy direct from manufacturers, can "stock" 165,000 titles, plus they offer bios, artwork, complete discographies and discussion groups, all accessible at the click of a mouse.
So given any world w, and standard accessibility relation between worlds, A is true at all worlds accessible from w, so also □A is true at w. Therefore, ⊨□A.
\(F\) holds at all worlds accessible from \ \Gamma\) and \(t\) is admissible evidence for \(F\) according to the given evidence function.
Because CVD involves the vapor phase transport of precursor molecules, deposition is possible at all locations accessible to the growth gases (in contrast to molecular beam epitaxy, which is directional).
But processes used in the past are not mental states concurrent with the target belief, and are not, in general (if at all), directly accessible to an agent now.
