Template:Selected anniversaries/June 19

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  • 1623: Mathematician, physicist, inventor, writer, and Christian philosopher Blaise Pascal born. He will do pioneering work on calculating machines.

    1623: Mathematician, physicist, inventor, writer, and Christian philosopher Blaise Pascal born. He will do pioneering work on calculating machines.

  • 1771: Mathematician and logician Joseph Diez Gergonne born. He will contribute to the principle of duality in projective geometry, by noticing that every theorem in the plane connecting points and lines corresponds to another theorem in which points and lines are interchanged, provided that the theorem embodied no metrical notions.

    1771: Mathematician and logician Joseph Diez Gergonne born. He will contribute to the principle of duality in projective geometry, by noticing that every theorem in the plane connecting points and lines corresponds to another theorem in which points and lines are interchanged, provided that the theorem embodied no metrical notions.

  • 1795: Surgeon and gentleman scientist James Braid born. He will be an important and influential pioneer of hypnotism and hypnotherapy.

    1795: Surgeon and gentleman scientist James Braid born. He will be an important and influential pioneer of hypnotism and hypnotherapy.

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