The Hairy Ball theorem, proved by Henri Poincaré in 1885, demonstrates that it's impossible to create a perfectly smooth hair pattern on a spherical surface. The theorem states that any continuous ...

Jack Allen Samuelson passed away peacefully on December 9th surrounded by family at his treasured home overlooking Santa Cruz. He was 91 years old, just a month short of celebrating his 92nd birthday.

For generations, Indian students have learnt it simply as the Pythagoras Theorem. In a quiet but significant shift, the Class 8 NCERT mathematics textbook has now introduced it as the ...