ABSTRACT
The words “scientifi c model” refer to such a variety of entities that it is diffi cult to say anything that would be true about all kinds of scientifi c models. For instance, not all of them are abstract entities, because the wood models of molecules, and their contemporary surrogates, namely, threedimensional computer-generated images, are concrete models, the interest of which being that they can be easily handled and looked at from different points of view. Likewise, models are not all mathematically presented, even if many of them are.
