(math.) a relationship where each input value corresponds to exactly one output value

letter or piece of correspondence; includes traditional mail and digital messages like email

to teach or conduct academic courses by correspondence or electronic communication

to send a letter to someone; to contact via mail or written communication

letters; correspondence; mail

a letter or correspondence received from someone

a reply sent in writing, often referring to an official letter or formal correspondence

Official letter or correspondence between organizations that are of equal rank or not subordinate to each other

In mathematics, functions related to the angles and sides of a triangle, such as sine, cosine, and tangent

A mathematical function where the highest power of the independent variable is two. is the second power

the wave function used to describe the state of a system in quantum mechanics

A strategic mountain pass in modern-day Lingbao, Henan, established by the State of Qin; known for its deep, box-like valley and role as the eastern gateway to the Qin State

to notify or inform someone through a formal letter or correspondence

letters and telegrams; written communication or electronic messages

secret or confidential letter

A mathematical function that can be graphed as a straight line.

a letter or correspondence; mail

City and main port in southern Hokkaido, Japan

an inverse function in mathematics

An informal letter or memo, typically one sent by an organization that is less formal in format than official documents.

to check up on or investigate someone's background through correspondence

A letter or card sent to express congratulations or greetings

a function where the value remains unchanged when the sign of the independent variable is flipped, satisfying the condition f(-x) = f(x)

an odd function in mathematics

to buy goods by sending an order through the mail

to request or ask for something by letter or post

a function whose derivative is the given function; antiderivative

a function in which the dependent variable is expressed in terms of the independent variable by means of an equation where the dependent variable is not isolated on one side

In mathematics, the derived function f' of an original function f

a mathematical function used to solve counting problems and sequences; generating function

a mapping between categories in mathematics

An anonymous letter containing false accusations, malicious attacks, or threats, especially in a political or professional context; popular in Taiwan.

letters or correspondence; literary term for a letter or document

a letter written for a specific purpose

an algebraic function in mathematics

algebraic function theory in mathematics

(math) a function that takes the value of a given function applied to the complement of its argument, such as cosine for sine

(literary) To write a letter; to compose a formal correspondence.

a file containing code and data that can be used simultaneously by multiple software programs, specifically in a computing context

(variant form) connotation; intension; meaningful content

(literary) a formal honorific used in letters when addressing one's teacher or a senior scholar, highly respected scholar; literally refers to the ten-foot space once maintained between a teacher and their students.

(literary) a person who manufactures armor and helmets; an armorer

to hand over to the law; abbreviation for [[函送法办|函送法辦|han2 song4 fa3 ban4]]

to sell goods by mail or through correspondence

to consult or discuss through letters or written correspondence

(abbreviation) a university that teaches students through mail or distance learning; short for [[函授大学|函授大學|han2 shou4 da4 xue2]]

a collection of subroutines or functions used to develop software or a software library

A university where courses are taught by mail or through other correspondence; often abbreviated as [[函大|函大|han2 da4]].