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Complex math formulas on whiteboard. Mathematics and science with economics Blackboard with math and science by writing on the blackboard. Library Happy teachers day text and mathematics equations over white lined paper banner Animated mathematical equations and geometric shapes floating over whiteboard Archimedean spiral on white background. Three turnings of one arm of an arithmetic spiral, rotating with constant angular velocity. Red spiral is represented on a polar graph. Illustration. Vector. Clock face. Measuring circle scale. Measuring round scale, Level indicator, measurement acceleration, circular meter, round meter for household appliances. 12 large divisions, 60 medium. Vector AI10 The universe within. Silhouette of a man inside the universe, physical and mathematical formulas.. The concept on scientific and philosophical topics. Elements of this image furnished by NASA. The concept of the human brain. The right creative hemisphere versus the left logical hemisphere. Education, science and medical abstract background. Protractor. Protractor grid for measuring degrees. Tilt angle meter. Measuring tool. AI10 Electronic calculator Hermann grid and scintillating grid illusion. In the left figure grey blobs perceived at the intersections. In the right figure dark dots seem to appear and disappear rapidly, hence scintillating.