Since, from a syntactic view point, similarly formed expressions will have similar forms, it is possible to define a single operation which will apply to only certain expressions that have a certain form, say, only to conjunctions, or conditionals.
Simply speaking Spanish can be difficult for some but trying to translate certain expressions into English is almost impossible -- even for Mexican actor Diego Luna.
Zoom in or out to catch certain expressions.
In later work (1989), however, Searle acknowledged that this account pushes us back to the question how certain expressions come to have the power to make declarations.
For example, if we add the rule to (R1)–(R4) then we will be able to further reduce certain expressions but at the price of losing confluency.
I decided to let the words wash around me and began to notice that certain expressions were repeated, such as: "Ecco" (Here we go), "Parliamo di" (Let's talk about), among others.
We speculate that this may be due to two complementary reasons: 1) Ubiquitous activators provide alternative solutions to the underlying combinatorial optimization problem of finding a fit CRM and 2) ubiquitous activators reduce the number of binding sites necessary to create certain expression patterns, and thus the number of steps (mutations) needed to find a fit solution.
If simplicity and conservativeness are of no concern, then you should not be appealing to Tarski-style interpretations in defining validity since the whole point of such interpretations is to allow the meanings of certain expressions to vary.
Alternatively, or perhaps in combination, the tissue of origin of the cells might influence the ability of the endothelioma lines to retain certain expression profiles.
Our hypothesis is that ubiquitous activators reduce the time necessary to evolve certain expression patterns, even if the same pattern might have been evolved without utilizing the ubiquitous activator.
