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==Constructive logic==
In a [[Constructive logic|constructive]] setting, the symmetry between ⥽ and <math>\Box</math> is broken, and the two connectives can be studied independently. Constructive strict implication can be used to investigate [[interpretability]] of [[Heyting arithmetic]] and to model [[arrow (computer science)|arrows]] and guarded [[recursion (computer science)|recursion]] in computer science.<ref>{{cite journal
| last1=Litak |first1 = Tadeusz
| last2=Visser |first2 = Albert
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