Tĩnh (Stationary)

The term "tĩnh" (stationary) refers to something that is not moving or not intended to be moved. In various contexts, it can have specific meanings:

In the context of physics and mechanics:

• Stationary Object: An object at rest with no movement. In mechanics, an object is considered stationary if it remains in the same position relative to a reference frame over time.
• Stationary Process: In statistics and probability theory, a stationary process is a stochastic process whose statistical properties, such as mean and variance, do not change over time.

In the context of mathematics:

• Stationary Point: A point on a graph where the derivative (slope) is zero. It could be a maximum, minimum, or saddle point.

In the context of office supplies:

• Stationery: Though pronounced similarly, "stationery" refers to writing materials and office supplies like paper, pens, envelopes, etc.

In everyday language:

• Stationary: Describes something that is not intended to be moved or is in a fixed position, such as a stationary bike used for exercise.

Examples of Usage:

1. Physics/Mechanics:
   • A book lying on a table is a stationary object as it is not moving relative to the table.
2. Mathematics:
   • Finding the stationary points of a function involves calculating the points where the first derivative of the function is zero.
3. Office Supplies:
   • A stationery store sells various writing instruments and paper products.

Understanding the context in which "tĩnh" (stationary) is used is crucial for interpreting its meaning accurately. Whether discussing physics, mathematics, or everyday items, the concept remains integral to various fields and applications.