Question: Frederick Valentine Atkinson, was a British mathematician, formerly of the University of Toronto, a public research university in Toronto, Ontario, in which country?

Context paragraphs:
Ryerson University: Ryerson University (commonly referred to as Ryerson) is a public research university in Toronto, Ontario, Canada.  Its urban campus surrounds the Yonge-Dundas Square, located at the busiest intersection in downtown Toronto.

Frederick Valentine Atkinson: Frederick Valentine Atkinson (Pinner, 25 January 1916 – Toronto, 13 November 2002) was a British mathematician, formerly of the University of Toronto, Canada, where he spent most of his career.  Atkinson's theorem and Atkinson–Wilcox theorem are named after him.  His Ph.D. advisor at Oxford was Edward Charles Titchmarsh.

University of Hagen: The University of Hagen (German: "FernUniversität in Hagen" , informally often referred to as FU Hagen) is a public research university that is primarily focused on distance teaching.  While its main campus is located in Hagen, North Rhine-Westphalia, Germany, the university maintains more than 50 study and research centers in Germany and throughout Europe.  According to the Federal Statistical Office of Germany it is Germany's largest university.  The university was founded in 1974 as a public research university by the state Nordrhein-Westfalen and began its research and teaching activities in 1975.  It was founded following the idea of UK's Open University to provide higher and continuing education opportunities through a distance education system in Germany.

University of Toronto: The University of Toronto (U of T, UToronto, or Toronto) is a public research university in Toronto, Ontario, Canada on the grounds that surround Queen's Park.  It was founded by royal charter in 1827 as "King's College", the first institution of higher learning in the colony of Upper Canada.  Originally controlled by the Church of England, the university assumed the present name in 1850 upon becoming a secular institution.  As a collegiate university, it comprises twelve colleges, which differ in character and history, each with substantial autonomy on financial and institutional affairs.  It has two satellite campuses in Scarborough and Mississauga.

Henry Atkinson (scientist): Henry Atkinson (1781–1829) was a British mathematician and astronomer whose interests extended to economics, engineering, and philosophy.  Born in West Harle, Northumberland, Atkinson was the son of a schoolmaster who allowed him to take over the teaching at Bavington School when he was only thirteen.  Atkinson subsequently taught at schools in the Northumberland villages of Belsay, Woodburn, and Stamfordham.  In 1808, he finally moved to Newcastle upon Tyne, where he continued to teach and began to establish a reputation as a scholar.

Daniel Ziegler: Rev. Daniel Ziegler (June 11, 1804 Reading, Pennsylvania – May 23, 1876 York, Pennsylvania) was a minister in Kreutz Creek and York, Pennsylvania, and also an avid entomologist.  He was a friend of Dr. Frederick Ernst Melsheimer (1782–1873), who like his father the Rev. Frederick Valentine Melsheimer (1749–1814), was also a keen entomologist.  Their collections ended up in Harvard University's Museum of Comparative Zoology, and comprised 14,774 specimens from 5,302 different species.

University Health Network: University Health Network (UHN) is a healthcare and medical research organization in Toronto, Ontario, Canada.  It is the largest such research organization in Canada and North America, ranking first in Canada for total research funding.  It was named Canada's top research hospital by Research Infosource in 2015.  It was created in 1999 by the Government of Ontario through the merger of four major hospitals: Toronto General Hospital, Toronto Western Hospital, Princess Margaret Cancer Centre, and the Toronto Rehabilitation Institute.  All four hospitals are affiliated with the Faculty of Medicine at the University of Toronto and serve as teaching hospitals for resident physicians, nurses, and other healthcare professions.  UHN also operates The Michener Institute, an applied health sciences college that opened in 1958.

Atkinson's theorem: In operator theory, Atkinson's theorem (named for Frederick Valentine Atkinson) gives a characterization of Fredholm operators.

University of Toronto (disambiguation): The University of Toronto is a public research university located principally in Toronto, Ontario, Canada.

Atkinson–Mingarelli theorem: In applied mathematics, the Atkinson–Mingarelli theorem, named after Frederick Valentine Atkinson and A. B. Mingarelli, concerns eigenvalues of certain Sturm–Liouville differential operators.

Supporting paragraphs: Frederick Valentine Atkinson University of Toronto
Answer: Canada