Christopher Clavius, SJ (25 March 1538 – 6 February 1612) was a Jesuit German mathematician and physicist, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by Aloysius Lilius, that is known as the Gregorian calendar. Clavius would later write defences and an explanation of the reformed calendar, including an emphatic acknowledgement of Lilius' work. In his last years, he was probably the most respected astronomer in Europe and his textbooks were used for astronomical education for over fifty years in and even out of Europe.
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Christopher Clavius in the context of Federico Commandino
Federico Commandino (1509 – 5 September 1575) was an Italian humanist and mathematician.
Born in Urbino, he studied at Padua and then at Ferrara, where he received his doctorate in medicine under Antonio Musa Brassavola. He had numerous patrons throughout his life. Initially, aided by Grassi, the bishop of Viterbo, he then came under the patronage of Pope Clement VIII. In Urbino, he was sponsored by Guidobaldo II della Rovere, but then came to Rome with cardinal Ranuccio Farnese. In Rome, he was patronized by Cardinal Cervini, who served briefly as Pope. Lured back to Urbino by Francesco Maria II della Rovere. In Urbino, he putatively met John Dee, and corresponded with the scholars Conrad Dasypodius (il Dasipodio), Gerolamo Cardano, Francesco Maurolico, and Christopher Clavius.
Christopher Clavius in the context of Bracket (mathematics)
In mathematics, brackets of various typographical forms, such as parentheses ( ), square brackets [ ], braces { } and angle brackets ⟨ ⟩, are frequently used in mathematical notation. Generally, such bracketing denotes some form of grouping: in evaluating an expression containing a bracketed sub-expression, the operators in the sub-expression take precedence over those surrounding it. Sometimes, for the clarity of reading, different kinds of brackets are used to express the same meaning of precedence in a single expression with deep nesting of sub-expressions.
Historically, other notations, such as the vinculum, were similarly used for grouping. In present-day use, these notations all have specific meanings. The earliest use of brackets to indicate aggregation (i.e. grouping) was suggested in 1608 by Christopher Clavius, and in 1629 by Albert Girard.