Infinity



GRE

解释

GRE 红宝书

• n. 无限的时间或空间
• ［英］ 无限的时间或空间 ( endless or unlimited space, time, distance, quantity, etc.)
• ［类］ 反义词: bounded space ( 有限空间)
• ［记］ in ( 无) +fin ( 结束) +ity -> 没有结束 -> 无穷

Webster Collegiate

noun (plural -ties)

• Date: 14th century
• 1.
  • a. the quality of being infinite
  • b. unlimited extent of time, space, or quantity ; boundlessness
• 2. an indefinitely great number or amount <an infinity of stars>
• 3.
  • a. the limit of the value of a function or variable when it tends to become numerically larger than any preassigned finite number
  • b. a part of a geometric magnitude that lies beyond any part whose distance from a given reference position is finite <do parallel lines ever meet if they extend to infinity>
  • c. a transfinite number (as aleph-null)
• 4. a distance so great that the rays of light from a point source at that distance may be regarded as parallel

---