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JOINT OPERATIONS - MEETING, INTERSECTION, DIFFERENCE AND COMPLEMENT - MATHEMATICS
Blog of sets, operations and problems with two and three sets: goo.gl/3yLNnb
Sets and operations on KZbin: goo.gl/Ca2FSh
Mathematics, sets and operations blog: goo.gl/KN17tk
Mathematics, theory, examples and exercises on KZbin: goo.gl/Kc6vkQ
Guillermo Quiñones Diaz, QuidiMat, GuillerMat.