Ivo Lah (; 5 September 1896 – 23 March 1979) was a
Slovenia
Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, an ...
n
mathematician
A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems.
Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change.
History
On ...
and
actuary, best known for his discovery of the
Lah number
In mathematics, the Lah numbers, discovered by Ivo Lah in 1954, are coefficients expressing rising factorials in terms of falling factorials. They are also the coefficients of the nth derivatives of e^.
Unsigned Lah numbers have an interesti ...
s in 1955 and for the
Lah identity. In the 1930s, Lah made the first tables about
mortality rate
Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of d ...
s in Slovenia.
Biography
Ivo Lah was born in
Štrukljeva Vas near
Cerknica
Cerknica (; , german: Zirknitz''Leksikon občin kraljestev in dežel zastopanih v državnem zboru,'' vol. 6: ''Kranjsko''. 1906. Vienna: C. Kr. Dvorna in Državna Tiskarna, p. 120.) is a town in the Karst region of southwestern Slovenia, with a p ...
,
Austria-Hungary
Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe between 1867 and 1918. It was formed with the Austro-Hungarian Compromise of ...
on 5 September 1896.
[
In the 1930s, Lah made the first tables about ]mortality rate
Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of d ...
s in Slovenia.[
Lah died at ]Ljubljana
Ljubljana (also known by other historical names) is the capital and largest city of Slovenia. It is the country's cultural, educational, economic, political and administrative center.
During antiquity, a Roman city called Emona stood in the are ...
, Yugoslavia
Yugoslavia (; sh-Latn-Cyrl, separator=" / ", Jugoslavija, Југославија ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; rue, label=Pannonian Rusyn, Югославия, translit=Juhoslavija ...
(which is in present-day Republic of Slovenia
Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and ...
).[
]
References
{{DEFAULTSORT:Lah, Ivo
1896 births
1979 deaths
Actuaries
20th-century Slovenian mathematicians
Yugoslav mathematicians
Faculty of Science, University of Zagreb alumni
University of Vienna alumni
Slovenian military personnel
Austro-Hungarian Army officers
Austro-Hungarian military personnel of World War I
Academic staff of the University of Zagreb
Academic staff of the Sapienza University of Rome
People from the Municipality of Cerknica