# Mathematician:Christopher Clavius

## Mathematician

German jesuit and logician.

Best known for:

- Clavius's Law (also written as
**Clavius' Law**), otherwise known as the**Consequentia Mirabilis**, which states that if by assuming the negation of a proposition you can prove its truth, then that proposition is true. - Being instrumental in the development of the Gregorian calendar.
- Writing highly-acclaimed and well-received text-books.

## Nationality

German

## History

- Born: 25 March 1538 in Bamberg, Bavaria (now in Germany)
- Died: 2 Feb 1612 in Rome (now in Italy)

## Theorems

Results named for **Christopher Clavius** can be found here.

## Publications

- 1574: Published a version of Euclid's
*The Elements*, which included some original material of his own, including Clavius's Law - 1593:
*In sphaeram Ioannis de Sacro Bosco Commentarius* - 1595:
*Novi calendarii romani apologia*(an argument in favour of the Gregorian calendar, which had been the cause of civil unrest) - 1608:
*Algebra*

*Christophori Clavii e Scoietate Jesu opera mathematica, quinque tomis distributa*, a five-volume edition of his collected works, containing the above works and others. Also of note:- An edition of
*Sphaerics*by Theodosius of Bithynia. - A commentary on the
*Tractatus de Sphaera*by John of Holywood.

- An edition of