Mathematical English: Mathematics, from the ancient Greek μ? θξμα(máthēma)； Often abbreviated as math or maths, it is a discipline that studies concepts such as quantity, structure, change, space and information.
Mathematics is a universal means for human beings to strictly describe and deduce the abstract structure and mode of things, and can be applied to any problem in the real world. All mathematical objects are artificially defined in essence.
In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics.
Mathematics plays an irreplaceable role in the development of human history and social life, and it is also an indispensable basic tool for studying and studying modern science and technology.
similar transformation
(1), change from one graphic to another, and keep the shape unchanged (the size can be changed) during the change. Such a graphic change is called graphic similarity transformation. The enlargement and reduction of graphics are similar transformations. The original graphic and the image obtained after similarity transformation are called similar graphics.
(2) The shape transformation of the graph does not change the size of each corner in the graph; Each line segment in the diagram is enlarged (or reduced) by the same multiple.