Ralph Lent Jeffery (3 October 1889 Overton,

Yarmouth County, Nova Scotia Yarmouth County is a rural county in the Canadian province of Nova Scotia. It has both traditional Anglo- Scottish and Acadian French culture as well as significant inland wilderness areas, including over 365 lakes and several major rivers. It co ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

– 1975

Wolfville, Nova Scotia Wolfville is a Canadian town in the Annapolis Valley, Kings County, Nova Scotia, located about northwest of the provincial capital, Halifax. The town is home to Acadia University and Landmark East School. The town is a tourist destination due ...

) was a Canadian

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 ...

working on analysis. He taught at several institutions including

Acadia University Acadia University is a public, predominantly undergraduate university located in Wolfville, Nova Scotia, Canada, with some graduate programs at the master's level and one at the doctoral level. The enabling legislation consists of the Acadia ...

, the

University of Saskatchewan A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. Universities typically offer both undergraduate and postgraduate programs. In the United States, ...

and Queen's University. Jeffery Hall at Queen's was named for him. In 1937 he was elected a Fellow of the Royal Society of Canada. In 1925 Jeffery exhibited a bounded function of two real variables,

continuous Continuity or continuous may refer to: Mathematics * Continuity (mathematics), the opposing concept to discreteness; common examples include ** Continuous probability distribution or random variable in probability and statistics ** Continuous ...

in each, yet fails to have an

integral In mathematics, an integral assigns numbers to functions in a way that describes displacement, area, volume, and other concepts that arise by combining infinitesimal data. The process of finding integrals is called integration. Along wit ...

. In 1951 Jeffery published ''Theory of Functions of a Real Variable'' which was noted for its coverage of integration theory.W.W. Rogosinski (1952) "Review: ''Functions of a Real Variable'',

The Mathematical Gazette ''The Mathematical Gazette'' is an academic journal of mathematics education, published three times yearly, that publishes "articles about the teaching and learning of mathematics with a focus on the 15–20 age range and expositions of attractive ...

Selected papers

* 1925: "Definite integrals containing a parameter",

Annals of Mathematics The ''Annals of Mathematics'' is a mathematical journal published every two months by Princeton University and the Institute for Advanced Study. History The journal was established as ''The Analyst'' in 1874 and with Joel E. Hendricks as the ...

26(3): 173 to 80 * 1926: "Functions of two variables for which the double integral does not exist", American Mathematical Monthly 33(3): 142,3 * 1931: "The uniform approximation of a sequence of integrals",

American Journal of Mathematics The ''American Journal of Mathematics'' is a bimonthly mathematics journal published by the Johns Hopkins University Press. History The ''American Journal of Mathematics'' is the oldest continuously published mathematical journal in the United S ...

53(1): 61 to 71 * 1933: "Sets of k-extent in n-dimensional space",

Transactions of the American Mathematical Society The ''Transactions of the American Mathematical Society'' is a monthly peer-reviewed scientific journal of mathematics published by the American Mathematical Society. It was established in 1900. As a requirement, all articles must be more than 15 p ...

35(3): 629 to 47

References

* * {{DEFAULTSORT:Jeffery, Ralph Lent Canadian mathematicians 1889 births 1975 deaths Presidents of the Canadian Mathematical Society Mathematical analysts