نتایج جستجو برای: in 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...
Polyacrylonitrile nanofibrous tubular structures were produced through typical and opposite charge electrospinning methods and the effect of the method as well as the two key electrospinning parameters, namely concentration of the electrospinning polymer solution and rotational speed of mandrel collector on properties of such tubular structures were studied. The smples were characterized by...
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...
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