Abstract: The purpose is to solve target problems in short calculation time certainly without describing algorithms that are data procedures on computers. As the solution method, because it is configured so that, when the initial values or variation values, which are used for constraint conditions with regard to target problems and the relevant constraint conditions, are set through Variable Value Setting 2, then Constraint Condition Extraction 3 extracts constraint conditions that are related to those variables, then Constraint Condition Calculation 4 searches for the solutions for each constraint condition one by one, and Variable Value Resetting repeats searching for the solutions for each constraint condition setting these searched solutions as new variables, so the course of solution searching becomes clear, and it becomes possible to surely reach the final solution and dramatically speed up computing, because each markedly simplified constraint condition has only to be solved.

Abstract: A lightweight frame for stretching or blocking fabric material comprising elongated metal side frame elements detachably coupled together at their adjacent ends by a coacting pair of corner elements which are selectively expandably movable and contractibly movable relative to one another, so as to increase or decrease the frame size. Rotatable actuators coacting with the corner elements provide for the selective expansion and contraction of the corner elements relative to one another, to thereby cause said expansion and contraction of the frame. By providing a series of different lengths of side frame elements, substantially different frame sizes can be expeditiously provided. The paired corner elements and the coacting side frame elements have means thereon for rapidly detachably coupling the frame and corner elements together, as well as for rapidly securing fabric material to and removing fabric material from the frame proper.