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  • Welcome to My New Blog

    July 3, 2019 by

    Hi all! I finally decided to have some blog with mathematical notes (I do not want to publish anything not concerning mathematics here, in particular this is why everything is assumed to be in “English”). I would continue on rus4.livejournal.com, but unfortunately livejournal does not support formulae and the easiest way to fix it seems… Read more

  • tetrahedron

    August 28, 2019 by

    Hi there! Today we prove that in an arbitrary tetrahedron . Draw three planes: through orthogonal to the external bisector of , through orthogonal to the external bisector of , through orthogonal to the external bisector of . Let them meet at point , and let be projections of onto lines respectively (see the picture).… Read more

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