Pyotr Ilyich Tchaikovsky 1840 – 1893 was a Russian composer of the Romantic period. He was the first Russian composer whose music made a lasting impression internationally, which was bolstered […]

Pathfinder’s Office Hours at the Science Circle   Are you interested in immersive learning, art and education in virtual worlds? Want to join an engaging discussion with a roundtable of […]

Solar Sierra and Windy Schor represent EnergyTeachers.org in Second Life, building virtual objects for exploring real-life technologies, and holding meetings and discussions between educators and interested people. Windy uses the […]

The Cantor Bernstein Schröder Theorem of Set Theory   The EQUIVALENCE THEOREM (a.k.a. Bernstein-Schröder Theorem) Modern set theory originated between 1874 – 1884 from the researches of Georg Cantor at Universität Halle, Germany. Around 1895, Cantor presented the EQUIVALENCE CONJECTURE: Given sets A and B, if A is equivalent to a subset of B and […]