The angle is introduced as follows:

Ji O (Pinyin: Ji O, jué) is a Chinese character (commonly used word) and a first-class universal standard of Chinese. This word first appeared in Shang Dynasty Oracle Bone Inscriptions and Shang Dynasty inscriptions, and its ancient glyph is like a beast horn, whose original meaning is beast horn. Extension refers to the horn shaped like a beast, also refers to the horn, or refers to the angle of an object, also refers to the headland.

The angle also refers to the auxiliary unit of money, which used to refer to one-fifth or one-tenth of the silver dollar; Now it refers to one-tenth of RMB one yuan, and the angle also extends the meaning of competition and winning, which is pronounced as jué. In the Song Dynasty, the famous prostitute with both color and art was called "corner prostitute". This leads to the meaning of roles and actors.

Corner is one of the radicals of Chinese characters, with the serial number 165. Words with "horn" as the signifier are generally related to animal horns or animal horn products, such as touching, licking (shāng) and licking (g not ng).

The introduction of mathematics is as follows:

Mathematics [English: Mathematics, from ancient Greece 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.

Numbers and spaces play an important role in analytic geometry, differential geometry and algebraic geometry. In differential geometry, there are concepts such as fiber bundle and calculation on manifold.

Algebraic geometry has the description of geometric objects such as polynomial equation solution set, which combines the concepts of number and space; There is also the study of topological groups, which combines structure and space. Lie groups are used to study space, structure and change.