対数(たいすう)

たいすう
noun
logarithm
number
1. logarithm
The mathematical function that gives the exponent to which a base must be raised to produce a given number. Common in high-school math, science, and engineering contexts.
高校(こうこう)で対数(たいすう)を習(なら)った。
I learned about logarithms in high school.
対数(たいすう)を使(つか)うと大(おお)きな数(かず)も扱(あつか)いやすくなる。
Using logarithms makes large numbers easier to handle.
地震(じしん)のマグニチュードは対数(たいすう)で表(あらわ)されているので、数値(すうち)が1(いち)違(ちが)うとエネルギーは約(やく)30(さんじゅう)倍(ばい)になる。
Earthquake magnitudes are expressed on a logarithmic scale, so a difference of 1 means about 30 times the energy.

Composed of 対(たい) (corresponding) + 数(すう) (number).

Common collocations

  • 常用対数(じょうようたいすう): common logarithm (base 10)
  • 自然対数(しぜんたいすう): natural logarithm (base e)
  • 対数(たいすう)関数(かんすう): logarithmic function
  • 対数(たいすう)グラフ: logarithmic graph

Similar words

  • 指数(しすう): exponent — the inverse concept; the power to which a base is raised
  • 累乗(るいじょう): power, exponentiation — the operation of raising a number to an exponent

Related Words

Compare: 指数(しすう) (exponent)
general
Added 2026.6.5 12:07 · Revised 2026.9.2 13:02
28500/28787_taisuu