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That may be found
better without than
with a diagram From the same point are drawn different right two lines one to
one point, another to another
a right line is the shortest that can be drawn
between any two points
If any othera right lines are once more use drawn from
the first point point in question to the 2 others, they must
be either the same with the two others
or different
If they are the same they dont come under
the point of the proposition which is predicated
of such as are different
They are eithermust state
taken together they must either be greater
than the first or less or equal
If taken together they are greater than one
at least if not both, must be greater & so
[+] to the corresponding
one of the other. each is not equal:[+] if taken together they
are less, than one at least if not both
must be less, & so in this case to, each
is not equal.
If taken together they are equal with the two
---page break---
L I Prop. 8 corresponding onestaken together, they must coincide
with them.
CLASSIFICATION
This proposition may serve as an example to
shew prove that the order of demonstration is not the
same with the order of invention.
It seems as if the Author had gotten some
inexplicit notion of the truth of it in the
ways I have been mentioning: but that which he
has used happen'd to be the first method that
occurred to him of proving it against
a gainsayer.
[+] to the several parts that are to be considered
names are given according to the
Ordinary method of Notation, it is included
in 3 boundaries to one of these boundaries is given
the name of A to another B to the remaining one
C. to the whole triangle thus included the
complex name ABC,
---page break---
Having then The Appellatives Upon precisely
this footing that is the footing of Proper names
stand those Appellatives which in the ordinary
method of notation in use in Geometry
are applied to denote any figure or part
of a figure upon which is drawn the demonstration
is exemplified. The Proposition we will say conceives
Triangles [Triangles we will say are the subject of the
Proposition] a Triangle is drawn [+] this
Triangle the moment it is drawn is
of a particular sort of Triangles it
is either an equilateral triangle an
Isosceles or a scalene not only so it is that an
Individual one triangle which is drawn
it is that Individual triangle which is
drawn. Of what is it then that these
letters are expressive? preparatively the Individual
lines which are its boundaries together. Of the
Individual space included between these
lines either the of those lines be situated
as they are so as to bound that whole individual triangle
or as we may say the whole area of that triangle
or else the Area itself that is so banded
[+] Sad consequence
would from
the diagrams, but
this seems a difficut
matter to effect.
is it not better
to leave the felon
at large with liberty
to spare his figure
himself keeping only
within the bands
of the genus specified.
---page break---
New Individual triangle we will suppose is of the sort which is called equilateral and Let us suppose that the proportion in question manner that the it has been demonstrated that its 3 angles aew equal to two right ones. the Scholar we will suppose perfectly ca????ed of the truth of it but at the end of the demonstration perhaps concludes this are these needs therefore the 3 angles of all triangles are equal to 2 right ones. at this he is staggered and it costs him much pain to be able to convince himself that the proposition would hold good af all under the Genus of Triangles. Euclid does not take pains enough to make his Scholar consider the figure he gives as example only and to convince them of the truth of the Proof with suspect figures to all figures of the Genus he gives and that if the Scholar were sufficiently opprised always the figure in question as an example only no [+]
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Identifier: | JB/135/029/002"JB/" can not be assigned to a declared number type with value 135. |
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135 |
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029 |
euclid |
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002 |
classification |
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copy/fair copy sheet |
2 |
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recto |
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sir samuel bentham |
[[watermarks::gr [with crown] [britannia motif]]] |
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46147 |
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