نتایج جستجو برای: opposite
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The opposite category of a category, contravariant functors and duality functors are defined. Next we state the proposition (1) the objects of C, the morphisms of C, the cod-map of C, the dom-map of C, (the composition of C),the id-map of C is a category. Let us consider C. The functor C op yielding a strict category is defined by the condition (Def. 1). (Def. 1) C op = the objects of C, the mo...
The possibility of simultaneous opposite running thermodynamic arrows of time has been raised on several occasions, for didactic purposes [1], for general interest [2], and to confound by “obvious” counterexample [2]. A difficulty in these considerations is the absence of a welldefined framework. For example, one might argue against opposing arrows as follows. Let the systems be A and B. An obs...
We use an exocentric pointing task to study exocentric visual directions to targets that are opposite to a pointer relative to the observer. (The apparent distance between the target and the pointer always exceeded 90 degrees of visual angle.) All pointing takes place in the horizontal plane at eye height. Observers could not see both target and pointer at a single glance. They had to look back...
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