Definition: 1.05: Surface

And a surface is that which has length and breadth only.

Modern Definition

A surface (or a curved surface) \(s\) is a connected subset of a Euclidean metric space \(A\in\mathbb R^n\), \(n\ge 2\) such that taking away a line \(g\subset s\), and given any point \(A\in g\) on the line \(g\) will disconnect a sufficiently small neighborhood of \(A\) in \(s\).

Definitions: 1 2 3

Thank you to the contributors under CC BY-SA 4.0!



Adapted from CC BY-SA 3.0 Sources:

  1. Callahan, Daniel: "Euclid’s 'Elements' Redux" 2014

Adapted from (Public Domain)

  1. Casey, John: "The First Six Books of the Elements of Euclid"

Adapted from (subject to copyright, with kind permission)

  1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"