Interesting inscription with letters inside on a black backgroundInteresting inscription with letters inside on a black background
A huge number of mathematical formulas on a gray background with a light centerA huge number of mathematical formulas on a gray background with a light center
A map of the world with marked points of major cities. earth mapA map of the world with marked points of major cities. Earth Map
Formulas in chalk on a blackboard in the form of abstractionFormulas in chalk on a blackboard in the form of abstraction
Сведения, необходимые для какого-н. вывода, решения. Основания для чего-н., качества.