A plane surface is any surface which lies evenly with the straight lines on itself.
A surface \(s\) is called a plane, if for two arbitrary points \(A,B\) in this surface also the straight line \(\overline{AB}\) joining them lies wholly in the surface.
\[A,B\in s\Longrightarrow\overline{AB}\subset s.\]
Axioms: 1
Chapters: 2
Corollaries: 3
Definitions: 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Examples: 23
Parts: 24
Proofs: 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
Propositions: 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83