envelope; case; letter

letter; piece of correspondence (incl. email)

letter; correspondence; slipcase

an informal letter sent by an organization

official letter

armor maker

letters; correspondence

to bring to justice; to hand over to the law (abbr. for 函送法辦|函送法办[han2 song4 fa3 ban4])

correspondence university (abbr. for 函授大學|函授大学[han2 shou4 da4 xue2])

functor (math.)

to teach by correspondence

function (math.)

variant of 涵洞[han2 dong4]

mail order

(formal) to inform by letter; to submit in writing

Hakodate, main port of south Hokkaidō 北海道[Bei3 hai3 dao4], Japan

a message of condolence

a reply (in writing)

(geology) (the earth's) mantle (Tw)

secret letter

incoming letter; letter from afar; same as 來信|来信[lai2 xin4]

a functional (math.)

enthalpy; heat content (thermodynamics)

to send a letter

letter of congratulations; greeting card (e.g. for New Year)

poison pen letter (Tw)

even function (math.)

library (partition on computer hard disk)

Hangu Pass in modern day Henan Province, strategic pass forming the eastern gate of the Qin State during the Warring States Period (770-221 BC)

antiderivative

inverse function (math.)

circular function; trigonometric function

odd function (math.)

derived function; derivative f' of a function f

generating function (math.)

wave function (in quantum mechanics)

implicit function

linear function (math.)

trigonometric function

quadratic function

(math.) algebraic function

correspondence university

correspondence course

to bring to justice; to hand over to the law

periodic function

callback function (computing)

function of a complex variable (math.)

multivalued function (math.)

function of a real variable (math.)