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{{Infobox scientist
| name = Alexandru Froda
| image =
| caption =
| birth_date = {{Birth date|1894|7|16|mf=y}}
| birth_place = [[Bucharest]],  [[Romania]]
| death_date = {{death date and age|1973|10|7|1894|7|16|mf=y}}
| death_place = [[Bucharest]], [[Romania]]
| residence = {{flag|Romania}}
| nationality = {{flag|Romania}}
| field = [[Mathematician]]
| work_institution = [[University of Bucharest]]
| alma_mater = [[University of Bucharest]]<br>[[University of Paris]]
| doctoral_advisor =
| doctoral_students =
| known_for  = [[Froda's theorem]]
| prizes =
| religion =
| footnotes = }}


'''Alexandru Froda''' (July 16, 1894, [[Bucharest]], [[Romania]]  &ndash; October 7, 1973, [[Bucharest]], [[Romania]]) was a well-known Romanian [[mathematician]] with important contributions in the field of [[mathematical analysis]], [[algebra]], [[number theory]] and [[rational mechanics]]. In his 1929 thesis he proved what is now known as [[Froda's theorem]].<ref name="ReferenceA">Alexandru Froda, ''Sur la distribution des proprietes de voisinage des functions de variables reelles'', These, Harmann, Paris, 3 December 1929</ref>


==Life==
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By studying what sorts of instances a particular legal representative tends to acquire and the type of results they get, you may be better able to evaluate if their abilities meet your requirements.<br><br>Will not automatically eliminate a legal representative simply because it costs you with a fee with regard to their evaluation. If the time they offer is pretty substantial, plus they are prepared to give you a good analysis of your respective case, that is worthy of paying out them a cost for this particular support. All attorneys that provide cost-free consultation services will not be always the most effective.<br><br>The purpose of an attorney is to help keep your likes and dislikes harmless. This is why you should have one check out a binding agreement before you sign it. Should you not, then you certainly won't possess any protections in the event the other celebrations to the agreement plan to cheat you. The words inside your agreement lets them.
Alexandru Froda was born in [[Bucharest]] in 1894. In 1927 he graduated from the University of Sciences (now the Faculty of Mathematics from the [[University of Bucharest]]). He received his Ph.D. from the [[University of Paris]] and from University of Bucharest in 1929. He was elected president of the Romanian Mathematical Society in 1946. In 1948 he became professor at the Faculty of Mathematics and Physics at the University of Bucharest.
 
==Work==
Froda's major contribution was in the field of [[mathematical analysis]]. His first important result<ref name="ReferenceA" /> was concerned with the set of discontinuities of a real-valued function of a real variable. In this theorem Froda proves that the set of [[Classification_of_discontinuities#Classification_of_discontinuities|simple discontinuities]] of a real-valued function of a real variable is at most countable.
 
In a paper<ref>A. Froda, ''Propriétés caractérisant la mesurabilité des fonctions multiformes et uniformes des variables réelles'', [[Comptes Rendus de l'Académie des Sciences]], Paris, 1936, t.203, p.1313</ref> from 1936 he proved a necessary and sufficient condition for a function to be [[Lebesgue-measurable_function|measurable]].
 
In the theory of [[algebraic equations]] Froda proved<ref>A. Froda, ''Résolution générale des équations algébriques'', Comptes Bendus de l'Academie de Sciences, Paris, 1929, t.189, p.523</ref> a method of solving algebraic equations having complex coefficients.
 
In 1929 [[Dimitrie Pompeiu]] conjectured that any continuous function of two real variables defined on the entire plane is constant if the integral over any circle in the plane is constant. In the same year<ref>A. Froda, ''Sur la propiete de D. Pompeiu, concernant les integrales des fonctions a deux variables reelles'', Bulletin de la Soc. Roumaine des Sciences, Bucharest, 1935, t.35, p.111-115</ref> Froda proved that, in the case that the conjecture is true, the condition that the function is defined on the whole plane is indispensable. Later it was shown that the conjecture is not true in general.  
 
In 1907 D. Pompeiu constructed an example of a continuous function with a nonzero derivative which has a zero in every interval. Using this result Froda finds a new way of looking at an older problem<ref>A. Froda, ''Ecuatii diferential Lavrentiev si functii Pompeiu'', Bul. Stiint. Acad. RPR, nr. 4, 1952</ref> posed by [[Mikhail Lavrentyev]] in 1925, namely whether there is a function of two real variables such that the [[ordinary differential equation]] <math>dy=f(x,y)dx</math> has at least two solutions passing through every point in the plane.
 
In the theory of numbers, beside rational triangles<ref>A. Froda, ''Triunghiuri Rationale'', Com. Acad. RPR, nr.12, 1955</ref> he also proved several conditions<ref>A. Froda, ''Criteres parametriques d'irrationallite'', Mathematica Scandinavica, Kovenhava, Vol. 13, 1963</ref><ref>A. Froda, ''Sur l'irrationalite des nombres reels, definis comme limite'', Revue Roumanie de mathematique oures et appliquees, Bucharest, vol.9, facs.7, 1964</ref><ref>A. Froda, ''Extension effective de la condition d'irrationalite de Vigg Bran'',Revue Roumaine de nathematique pures et appliquees, Bucharest, vol.10, no.7, 1965, p.923-929</ref><ref>A. Froda, ''Sur le familles de criteres d'irrationalite'', Math. Z., 1965, 89, p.126-136</ref><ref>A. Froda, ''Nouveaux criteres parametriques d'irrationalite'', C. d'Acad. des Sciences, Paris, t.261, p.338-349</ref>
for a real number, which is the limit of a [[Rational number|rational]] convergent [[sequence]], to be [[irrational]], extending a previous result of [[Viggo Brun]] from 1910.<ref>Viggo Brun, ''Ein Satz uber Irrationalitat'', Aktiv fur Mathemaik, 09 Naturvidensgab, Kristiania, vol.31, H3, 1910.</ref>
 
In 1937 Froda independently noticed and proved the case <math>n=1</math> of the [[Borsuk-Ulam theorem]].
 
==See also==
[[Froda's theorem]]
 
==References==
{{Reflist}}
 
{{Authority control|VIAF=224498113}}
{{Persondata <!-- Metadata: see [[Wikipedia:Persondata]]. -->
| NAME              = Froda, Alexandru
| ALTERNATIVE NAMES =
| SHORT DESCRIPTION = Romanian mathematician
| DATE OF BIRTH    = July 16, 1894
| PLACE OF BIRTH    = [[Bucharest]],  [[Romania]]
| DATE OF DEATH    = October 7, 1973
| PLACE OF DEATH    = [[Bucharest]], [[Romania]]
}}
{{DEFAULTSORT:Froda, Alexandru}}
[[Category:20th-century mathematicians]]
[[Category:Romanian mathematicians]]
[[Category:Romanian academics]]
[[Category:University of Bucharest faculty]]
[[Category:1894 births]]
[[Category:1969 deaths]]

Latest revision as of 01:04, 3 May 2014


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