||This article includes a list of references, related reading or
external links, but its sources remain unclear because it lacks
inline citations. (May 2012)| The common logarithm is the
logarithm with base 10. It is also known as the decadic
logarithm and also as the decimal logarithm, named after its
base, or Briggsian logarithm, after Henry Briggs, an English
mathematician who pioneered its use. It is indicated by
log10(x), or sometimes Log(x) with a capital L (however, this
notation is ambiguous since it can also mean the complex natural
logarithmic multi-valued function). On calculators it is usually
"log", but mathematicians usually mean natural logarithm rather
than common logarithm when they write "log". To mitigate this
ambiguity the ISO specification is that log10(x) should be lg
(x) and loge(x) should be ln (x). Before the early 1970s,
handheld electronic calculators were not yet in widespread use.
Due to their utility in saving work in laborious multiplications
and divisions with pen and paper, ta