# Geometry

## Found in 58 Collections and/or Records:

### A paper of my own about the descent in a Cycloid printed in the Philosophical Transactions of the Royal Society in 1697, cFebruary 1697

A late draft of an elementary development of Christiaan Huygens' work on the cycloid, that finally appeared anonymously in the Philosophical Transactions of the Royal Society for February 1697 (nos 225, 424).

**Dates:**cFebruary 1697

### A problem proposed by Robert Anderson 1698 about Geometry, c1675-1698

A search for a way to find an angle in a right triangle bisected laterally by a parabola. It is signed "Rob:t Anderson", and is written in a hand presumably his. Gregory has written, "sent to me by Mr G Keith Aprilo 1698) at the bottom.

**Dates:**c1675-1698

### Ad Geometriam Indivisibilium, 1680's

Theorems attributed to one 'Cavillarius', possibly Francesco Bonaventura Cavalieri (1598-1647), Jesuit mathematician from Bologna.

**Dates:**1680's

### An account of a manuscript..., c1703

A manuscript reviewed by Gregory for a colleague (whose name is illegible), mostly concerning Euclid.

**Dates:**c1703

### Apud Doctorem Ruyschium Amsterodami, 24 May 1693

**Dates:**24 May 1693

### Astronomiae Physicae et Geometricae Elementa, 28 February 1698

Notes from a London meeting with Sir Isaac Newton on a revised plan for the Astronomiae physicae et geometricae elementa, (1702), Gregory's most important work. An erratum lies at the foot of this document, unrelated to it or to any of the other things on the sheet (which have their own entries in Gregory's index): a jotting about refraction, crystals, and cataracts of the eye. This is dated London, 30 May 1708.

**Dates:**28 February 1698

### Canon Slusz de tangentiibus Curv: ..., 1680-1681

Extract of a letter, written in an unknown hand, from RenÃ© FranÃ§ois de Sluse to the publisher of the Philosophical Transactions, concerning his general algorithm on Fermat's application of his own method of maxima and minima to tangents. De Sluse's article appeared in January 1673.

**Dates:**1680-1681

### Collatio Dat: Euclidis, c1703

Notes on Gregory's Euclid volume.

**Dates:**c1703

### Contra Cartesium de refractione, 1680's

A general critique of Cartesian geometry.

**Dates:**1680's

### Corrigenda in Libris Apollonii, December 1705

Corrections for Gregory's volume on Apollonius.

**Dates:**December 1705