The speed of light refers to how fast light travels in a vacuum or a transparent medium. In a vacuum, the speed of light is usually calculated as 300,000 kilometers per second, which is a fundamental constant in physics.
Compound interest, commonly known as 'interest on interest,' refers to the method of adding interest to the principal and then calculating interest again, allowing your money to grow exponentially over time.
A light cone is a term in physics used to describe the structure of spacetime. It refers to the geometric shape formed by the range of light signals spreading out from an event in spacetime. In four-dimensional spacetime, we usually replace the time dimension t with the z-axis in three-dimensional space. Taking the point where the event happens (x0, y0, t0) as the origin, its mathematical expression defines the spatial range using the product of the speed of light c and time t (ct) as the radius.
Complex numbers are a special kind of number in math, written in the form a + bi, where a and b are real numbers and i is the imaginary unit that satisfies i² = -1. They expand the range of real numbers, allowing some equations that originally had no solutions to have answers, and they're commonly used in fields like physics, engineering, and signal processing.
A trajectory is the trace left by a moving point following certain rules. Simply put, it's a shape made up of all points that meet specific conditions. There are two strict rules: first, every point on the shape must meet the conditions, and second, all points that meet the conditions must be on the shape—no more, no less.
It's a number used to show how likely something is to happen. For a random event A, its probability is denoted as P(A).
"Probability levels" usually refer to the qualitative or quantitative grading of how likely an event is to happen in risk assessment, reliability engineering, or safety analysis (commonly from levels 1–5 or A–E), but the exact divisions vary by industry/standard, and there's no unified global standard.
A probability distribution is a complete mathematical description of all possible values a random variable can take and their corresponding probabilities. It reveals the statistical patterns behind random events and is the foundation of probability theory and statistics.
A system of equations is a set of two or more equations, and the solution needs to satisfy all the equations at the same time. Simply put, it’s like putting a few formulas together, and the unknowns inside (like x, y) have to be the same number in all the formulas in order to get the result.
Analyzing data usually refers to using statistical methods to organize, study, and summarize a large amount of collected data, extracting useful information and forming conclusions to help with business or operational decisions. In English, it's commonly called Data Analysis or Analyze Data.