Question

Why Euclidean Geometry is not a modern deductive system?

score 117 · Answer 1 · 2018-03-21 07:25:00

117

Views

Why Euclidean Geometry is not a modern deductive system?

Published on 21 Mar 2018 - 7:25

score 36 · Answer 2 · 2018-03-21 13:29:17

36

Views

Given the figure. Prove that $CA=2 \cdot EH$

Published on 21 Mar 2018 - 13:29

score 33 · Answer 3 · 2018-03-21 14:06:38

33

Views

Determinant of a metric in the three dimensional positive?

Published on 21 Mar 2018 - 14:06

score 71 · Answer 4 · 2018-03-21 14:31:59

71

Views

Suppose $AB/AF=CB/CD=3$ Prove that $E$ is the midpoint of $\overline{AC}$

Published on 21 Mar 2018 - 14:31

score 147 · Answer 5 · 2026-03-24 23:46:19

147

Views

Can we prove consistency of Euclidean geometry in Peano arithmetic?

Published on 24 Mar 2026 - 23:46

score 31 · Answer 6 · 2026-03-25 12:15:26

31

Views

Condition for a restricted ball to be inside an ellipse

Published on 25 Mar 2026 - 12:15

score 4.3k · Answer 7 · 2026-03-25 15:17:54

4.3k

Views

Four circles tangent to each other and an equilateral triangle

Published on 25 Mar 2026 - 15:17

score 65 · Answer 8 · 2018-03-23 06:45:18

65

Views

Angles of intersecting tangent lines of a circle

Published on 23 Mar 2018 - 6:45

score 43 · Answer 9 · 2026-03-25 12:53:00

43

Views

$BE,BC,CD$ form side lengths of a triangle

Published on 25 Mar 2026 - 12:53

score 157 · Answer 10 · 2026-03-25 01:27:24

157

Views

Orientation and sign of rotation matrix for projective transformation

Published on 25 Mar 2026 - 1:27

score 70 · Answer 11 · 2026-03-25 01:16:56

70

Views

Find an angle not on the circumference of a circle problem.

Published on 25 Mar 2026 - 1:16

score 505 · Answer 12 · 2026-03-25 06:05:15

505

Views

Straightedge and compass construction: focus of a parabola given $A,B,V$

Published on 25 Mar 2026 - 6:05

score 1.3k · Answer 13 · 2018-03-25 19:37:59

Let $A,B,C,D$ lie on a circle, $AD$ and $BC$ meet at $E$. The circle through $A,C,E$ have centre $O$. Prove that $BD$ is perpendicular to $EO$.

score 53 · Answer 14 · 2026-03-25 15:17:50

53

Views

Concurrence of diagonals on a particular hexagon

Published on 25 Mar 2026 - 15:17

score 382 · Answer 15 · 2018-03-26 13:54:22

382

Views

Solution to a-concentric-circle-problem

Published on 26 Mar 2018 - 13:54

List Question

Why Euclidean Geometry is not a modern deductive system?

Given the figure. Prove that $CA=2 \cdot EH$

Determinant of a metric in the three dimensional positive?

Suppose $AB/AF=CB/CD=3$ Prove that $E$ is the midpoint of $\overline{AC}$

Can we prove consistency of Euclidean geometry in Peano arithmetic?

Condition for a restricted ball to be inside an ellipse

Four circles tangent to each other and an equilateral triangle

Angles of intersecting tangent lines of a circle

$BE,BC,CD$ form side lengths of a triangle

Orientation and sign of rotation matrix for projective transformation

Find an angle not on the circumference of a circle problem.

Straightedge and compass construction: focus of a parabola given $A,B,V$

Let $A,B,C,D$ lie on a circle, $AD$ and $BC$ meet at $E$. The circle through $A,C,E$ have centre $O$. Prove that $BD$ is perpendicular to $EO$.

Concurrence of diagonals on a particular hexagon

Solution to a-concentric-circle-problem

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