Euclid and His Modern Rivals

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Macmillan, 1885 - 275 sider
 

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Since I must clearly freely admit that I do not have the technical training to assess the truth of the arguments, I must simply follow my custom of stating my reading of the style-- since I am, after ... Les hele vurderingen

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I
xxxiii
II
2
III
50
VI
51
VIII
56
IX
60
X
67
XII
93
XIV
154
XVI
177
XVII
205

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Populære avsnitt

Side 131 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Side 139 - Your geometry states it as an axiom that a straight line is the shortest way from one point to another: and astronomy shows you that God has given motion only in curves.
Side 30 - Thus, for" example, he to whom the geometrical proposition, that the angles of a triangle are together equal to two right angles...
Side 197 - If there are three or more parallel straight lines, and the intercepts made by them on any straight line that cuts them are equal, then the corresponding intercepts on any other straight line that cuts them are also equal.
Side 94 - ... angle. An acute angle is one which is less than a right angle.
Side 199 - The sum of the squares on two sides of a triangle is double the sum of the squares on half the base and on the line joining the vertex to the middle point of the base.
Side 63 - Min. I accept all that. Nie. We then introduce Euclid's definition of ' Parallels. It is of course now obvious that parallel Lines are equidistant, and that equidistant Lines are parallel. Min. Certainly. Nie. We can now, with the help of Euc. I. 27, prove I. 29, and thence I. 32. Min. No doubt. We see, then, that you propose, as a substitute for Euclid's i2th Axiom, a new Definition, two new Axioms, and what virtually amounts to five new Theorems. In point of ' axiomaticity ' I do not think there...
Side 89 - Theorem. In every Triangle the greater side is opposite to the greater angle, and conversely, the greater angle is opposite to the greater side.
Side 199 - To construct a rectilineal Figure equal to a given rectilineal Figure and having the number of its sides one less than that of the given figure ; and thence to construct a Triangle equal to a given rectilineal Figure.
Side 196 - Assuming that the areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles...

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