Profile cover photo
Profile photo
Alexander Bogomolny
Love math. Care for math education.
Love math. Care for math education.
About
Alexander's posts

Post has attachment
Simple Inequality with a Variety of Solutions. Find something essentially deffierent

http://www.cut-the-knot.org/m/Algebra/SimpleInequalityWithVarietyOfSolutions.shtml

#FigureThat 
Photo

Post has attachment
I is the incenter of ΔABC. The circumcenters of Δs ABI, BCI, CAI lie on the circumcircle of ΔABC

http://www.cut-the-knot.org/Curriculum/Geometry/IncirclesCircumcircles.shtml

#FigureThat #geometry #math
Photo

Post has attachment
I is the incenter of ΔABC, O the circumcenter of ΔBIC. Prove: O lies on AI

http://www.cut-the-knot.org/Curriculum/Geometry/CircumcenterOnAngleBisector.shtml

#FigureThat #geometry
Photo

Post has attachment

Post has attachment
Great blue heron - one of the most elegant birds

#birdphotography #naturephotography 
Photo

Post has attachment

Post has attachment
Never before have I seen a killdeer settling between stones or anywhere else. Usually they just run around along a shoreline, picking food. This one was settling in crevices every few steps. I expected her to start laying eggs but eventually it flew away, perhaps annoyed by my following her arround

#birdphotography #naturephotography 
Photo

Post has attachment
Just a flying heron and water - no occlusions, no distractions

#birdphotography #naturephotography #birdsinflight
Photo

Post has attachment
It seems to me that heron's eyes could be seen even from behind, though, perhaps, one should make an effort

#birdphotography #naturephotography 
Photo

Post has attachment
Wait while more posts are being loaded