It is shown that all the assumptions for symmetric monoidal categories flow out of a unifying principle involving natural isomorphisms of the type (A ∧B) ∧ (C ∧D) → (A ∧ C) ∧ (B ∧D), called medial commutativity. Medial commutativity in the presence of the unit object enables us to define associativity and commutativity natural isomorphisms. In particular, Mac Lane’s pentagonal and hexagonal coh...

results three hundred patients were eligible for the study. after 1 month, 62% of patients (186 patients) reported good pain relief [95% confidence interval (ci) 0.53, 0.7]; 8.6% (26 patients) reported excellent pain relief (95% ci 0.07-0.09); 20. 4% (61 patients) reported poor pain relief (95% ci 0.18-0.22), and 9% (27 patients) reported no pain relief (95% ci 0.08-0.099). the average pain num...

background: in this experimental study, the radiographic and biomechanical characteristics of osteoperforated rabbit tibia during bone repair period were investigated. materials and methods: using dental drills, 2 mm holes were drilled at the mid-shaft of right tibia in 12 new zealand white rabbits. the left tibia was intact and selected as the control. x-rays of the left and right tibias were ...

the purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on balance in elderly women. fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. participants were asked to stand still on a stability platform under each of two conditions (with visual feedback and without visual feedback) in three levels of diff...