A linear equation, also called a first-degree equation, refers to an equation where all the unknowns are to the first power.
math system
A line segment is the part between two points on a straight line; it has endpoints at both ends and a fixed length.
In real life, 'images' are mainly abstracted in math as 2D functions, pixel matrices, or geometric trajectories.
In math, a chord is just the line segment that connects any two points on a curve (like a circle).
Special relativity is a physics theory proposed by Einstein in 1905, and its core idea is that time and space aren't absolute—they change with speed.
A coefficient is the numerical factor in a term of an algebraic expression, usually showing the quantitative relationship between variables. For example, the Pearson correlation coefficient can measure how strongly variables are related.
Physics is the study of the most general laws of motion of matter and the basic structure of matter. As a leading branch of natural science, it looks into everything from the vast universe to tiny fundamental particles, exploring the most basic forms and laws of motion of all matter, which makes it the foundation for research in other natural sciences. This field started back in the days of Galileo and Newton and has now grown into a fundamental science with many branches. It's both an experimental science and one that values rational thinking and logical reasoning, heavily relying on math as its working language, making it one of the most precise natural sciences today.
A pentagon is a closed shape made by connecting five line segments end to end, and the sum of its interior angles is 540 degrees.
The infinite monkey theorem says that if a monkey types randomly forever, it will almost surely type out any text—it's a classic thought experiment in probability theory.