Births on September 22

Paolo Ruffini

Born on September 22, 1765

Paolo Ruffini, Italian mathematician and philosopher (d. 1822)

Paolo Ruffini (22 September 1765 – 10 May 1822) was an Italian mathematician and philosopher.

By 1788 he had earned university degrees in philosophy, medicine/surgery and mathematics. His works include developments in algebra:

an incomplete proof (Abel–Ruffini theorem) that quintic (and higher-order) equations cannot be solved by radicals (1799),

Ruffini's rule which is a quick method for polynomial division,

contributions to group theory.He also wrote on probability and the quadrature of the circle.

He was a professor of mathematics at the University of Modena and a medical doctor including scientific work on typhus.

References

Paolo Ruffini

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Events on 1765

9 Mar

Jean Calas
After a campaign by the writer Voltaire, judges in Paris posthumously exonerate Jean Calas of murdering his son. Calas had been tortured and executed in 1762 on the charge, though his son may have actually committed suicide.
22 Mar

Stamp Act 1765
The British Parliament passes the Stamp Act that introduces a tax to be levied directly on its American colonies.
24 Mar

Quartering Act
Great Britain passes the Quartering Act, which requires the Thirteen Colonies to house British troops.

Births on September 22

Paolo Ruffini

Born on September 22, 1765

References

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Events on 1765

Jean Calas

Stamp Act 1765

Quartering Act