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of recent non-logical symbols in expressiveness comparisons. For instance, in some logics the concept of infinitely many is embedded in a logical fixed whereas in others, it must be “constructed” with the help of non-logical symbols. Thus, PC and RPC consider additionally the latent expressive power of a logic, so to talk. ABSTRACT. The concept of expressive energy, or energy, may be very relevant and frequent in comparisons of logics. Despite its ubiquity, it nonetheless lacks a conceptual elucidation and that is manifested in two methods. On the one hand, it’s not unusual to see the notion of expressiveness employed in comparisons of logics on imprecise and varying grounds. This creates confusion in the literature and hardens the method of building upon different’s results. On the opposite hand, when care is taken to specify that the formal criterion of expressiveness being used is a certain E, there may be typically no additional comment on it, e.g. intuitive motivations or why E was chosen within the first place (E.g. in , , and ). This gives the look that the idea of expressiveness has been totally elucidated, and it’s clearest and best formal counterpart is E. This can also be misleading, since there are prima facie plausible however conflicting formal methods to check expressiveness of logics. This work is intended to deal with these points. Another important item in the classical agenda is that of omitting types, that’s, the development of fashions the place sure properties of components are never satisfied. In steady model concept the construction of models omitting many varieties is well known , but in MFL has only been addressed
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