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  1. 28 Feb 2019
    Replying to

    The shortest arc between two points on a sphere is created by a plane that intersects those two points and the center of the sphere. Notice that it’s a sphere

  2. Girard Desargues (1591-1661) was a French engineer, who is considered one of the founders of .

  3. 1 Dec 2019

    Spending Sunday afternoon making conic sections via the intersections of two projective (non-perspective) pencils of points.

  4. 4 Jun 2018
  5. 20 Jan 2018
    Replying to

    Looks like your sneezes are parallel lines which intersects at a point which lies on the line at infinity ! :)

  6. 25 Jun 2013

    Mr Malinsky led the 2nd workshop in today...members LOVED it! Got the brains working in new ways!

  7. Replying to

    If you like this and would like to make it rigorous, learn ! Founded by artists, studied by mathematicians, applied by physicists and internet security protocols.

  8. Replying to

    parallel lines intersect at a point which lies on the line at infinity. you can't stop their love! 😍

  9. 20 Nov 2017

    'Two parallel lines meets at Infinity' But they are Parallel then how come they ever meet ? .... 😉😐😏😶

  10. 20 Jul 2011

    Two parallel lines meet at infinity.

  11. 22 Oct 2013

    A drawing I did for a hw assgn

  12. Jan 30

    My glass of coffee that I sketched while waiting on a friend. I was fascinated by how the reflection of the napkin mapped onto the glass.

  13. 21 Nov 2012

    Gerard Desargues … what have you done to me???

  14. 25 Oct 2019

    The real projective line is a circle, while the complex projective line is a sphere.

  15. 13 Aug 2019

    The points of the real projective line are lines through the origin in the real number plane. The point at infinity is, for convenience, either the vertical axis or the horizontal axis.

  16. 7 Aug 2019

    The real projective plane PG(2,R) is equivalent to R^2 together with the line at infinity L. The line at infinity L, and all lines in PG(2,R), are equivalent to PG(1,R), the real projective line, which is topologically a circle.

  17. 18 Mar 2019

    Some of my favourites (so far all of which have been very good!) Some are v thin e.g. Mazur, Arnold, but all excellent.

  18. 17 Mar 2019
  19. 15 Jul 2018
  20. Replying to

    To a nonsingular plane conic C and two points in P^2, we associate a rational map f from S :=S^2C to P^2. Find a minimal resolution of indeterminacy g fit f. Compute deg g. Determine the locus where dg isn't an isomorphism.

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