1623 Clermond-Ferrand - 1662, Paris

At the age of 14 Blaise Pascal started to accompany his father to Mersenne's meetings. Mersenne belonged to the religious order of the Minims, and his cell in Paris was a frequent meeting place for Gassendi, Roberval, Carcavi, Auzout, Mydorge, Mylon, Desargues and others. Soon, certainly by the time he was 15, Blaise came to admire the work of Desargues. At the age of sixteen, Pascal presented a single piece of paper to one of Mersenne's meetings in June 1639. It contained a number of projective geometry theorems, including Pascal's mystic hexagon.

In December 1639 the Pascal family left Paris to live in Rouen where Etienne had been appointed as a tax collector
for Upper Normandy. Shortly after settling in Rouen, Blaise had his first work, *Essay on Conic Sections* published
in February 1640.

Pascal invented the first digital calculator to help his father with his work collecting taxes. He worked on it for three years between 1642 and 1645. The device, called the Pascaline, resembled a mechanical calculator of the 1940's. This, almost certainly, makes Pascal the second person to invent a mechanical calculator for Schickard had manufactured one in 1624.

There were problems faced by Pascal in the design of the calculator which were due to the design of the French
currency at that time. There were 20 sols in a livre and 12 deniers in a sol. The system remained in France until 1799
but in Britain a system with similar multiples lasted until 1971. Pascal had to solve much harder technical problems
to work with this division of the livre into 240 than he would have had if the division had been 100. However production
of the machines started in 1642 but, as Adamson writes,

*By *1652* fifty prototypes had been produced, but few machines were sold, and manufacture of Pascal's
arithmetical calculator ceased in that year.*

Events of 1646 were very significant for the young Pascal. In that year his father injured his leg and had to recuperate in his house. He was looked after by two young brothers from a religious movement just outside Rouen. They had a profound effect on the young Pascal and he became deeply religious.

From about this time Pascal began a series of experiments on atmospheric pressure. By 1647 he had proved to his
satisfaction that a vacuum existed. Descartes visited Pascal on 23 September. His visit
only lasted two days and the two argued about the vacuum which Descartes did not believe
in. Descartes wrote, rather cruelly, in a letter to Huygens after this visit that Pascal

*...has too much vacuum in his head.*

In August of 1648 Pascal observed that the pressure of the atmosphere decreases with height and deduced that a vacuum
existed above the atmosphere. Descartes wrote to Carcavi in June 1647 about Pascal's
experiments saying:

*It was I who two years ago advised him to do it, for although I have not performed it myself, I did not doubt of its
success ...*

In October 1647 Pascal wrote *New Experiments Concerning Vacuums* which led to disputes with a number of
scientists who, like Descartes, did not believe in a vacuum.

Etienne Pascal died in September 1651 and following this Blaise wrote to one of his sisters giving a deeply Christian
meaning to death in general and his father's death in particular. His ideas here were to form the basis for his later
philosophical work *Pensées*.

From May 1653 Pascal worked on mathematics and physics writing *Treatise on the Equilibrium of Liquids* (1653)
in which he explains Pascal's law of pressure. Adamson writes:

*This treatise is a complete outline of a system of hydrostatics, the first in the history of science, it embodies
his most distinctive and important contribution to physical theory.*

He worked on conic sections and produced important theorems in
projective geometry. In *The Generation of Conic Sections* (mostly completed by March
1648 but worked on again in 1653 and 1654) Pascal considered conics generated by central
projection of a circle. This was meant to be the first part of a treatise on conics which
Pascal never completed. The work is now lost but Leibniz and
Tschirnhaus made notes from it and it is through these notes that a fairly complete
picture of the work is now possible.

Although Pascal was not the first to study Pascal's triangle, his
work on the topic in *Treatise on the Arithmetical Triangle* was the most important
on this topic and, through the work of Wallis, Pascal's work on the binomial coefficients
was to lead Newton to his discovery of the general binomial
theorem for fractional and negative powers.

In correspondence with Fermat he laid the foundation for the theory of probability. This correspondence consisted of five letters and occurred in the summer of 1654. They considered the dice problem, already studied by Cardan, and the problem of points also considered by Cardan and, around the same time, Pacioli and Tartaglia. The dice problem asks how many times one must throw a pair of dice before one expects a double six while the problem of points asks how to divide the stakes if a game of dice is incomplete. They solved the problem of points for a two player game but did not develop powerful enough mathematical methods to solve it for three or more players.

Through the period of this correspondence Pascal was unwell. In one
of the letters to Fermat written in July 1654 he writes

*... though I am still bedridden, I must tell you that yesterday evening I was given your letter.*

However, despite his health problems, he worked intensely on scientific and mathematical questions until October 1654. Sometime around then he nearly lost his life in an accident. The horses pulling his carriage bolted and the carriage was left hanging over a bridge above the river Seine. Although he was rescued without any physical injury, it does appear that he was much affected psychologically. Not long after he underwent another religious experience, on 23 November 1654, and he pledged his life to Christianity.

After this time Pascal made visits to the Jansenist monastery
Port-Royal des Champs about 30 km south west of Paris. He began to publish anonymous works
on religious topics, eighteen *Provincial Letters* being published during 1656 and
early 1657. These were written in defence of his friend Antoine Arnauld, an opponent of
the Jesuits and a defender of Jansenism, who was on trial before the faculty of theology
in Paris for his controversial religious works. Pascal's most famous work in philosophy is
*Pensées*, a collection of personal thoughts on human suffering and faith in God
which he began in late 1656 and continued to work on during 1657 and 1658. This work
contains 'Pascal's wager' which claims to prove that belief in God is rational with the following argument.

*If God does not exist, one will lose nothing by believing in him,
while if he does exist, one will lose everything by not believing.*

With 'Pascal's wager' he uses probabilistic and mathematical arguments but his main conclusion is that

*...we are compelled to gamble...*

His last work was on the cycloid, the curve traced by a point on the circumference of a rolling circle. In 1658 Pascal started to think about mathematical problems again as he lay awake at night unable to sleep for pain. He applied Cavalieri's calculus of indivisibles to the problem of the area of any segment of the cycloid and the centre of gravity of any segment. He also solved the problems of the volume and surface area of the solid of revolution formed by rotating the cycloid about the x-axis.

Pascal published a challenge offering two prizes for solutions to these problems to Wren, Laloubère, Leibniz, Huygens, Wallis, Fermat and several other mathematicians. Wallis and Laloubère entered the competition but Laloubère's solution was wrong and Wallis was also not successful. Sluze, Ricci, Huygens, Wren and Fermat all communicated their discoveries to Pascal without entering the competition. Wren had been working on Pascal's challenge and he in turn challenged Pascal, Fermat and Roberval to find the arc length, the length of the arch, of the cycloid.

Pascal published his own solutions to his challenge problems in the *Letters
to Carcavi.* After that time on he took little interest in science and spent his last
years giving to the poor and going from church to church in Paris attending one religious
service after another.

He is described as:

His character is described as:

Article by: J J O'Connor and E F Robertson