Category Archives: Mathematic

When was Saint Basil’s Cathedral built ?

1555 – 1561

Saint Basil’s Cathedralcommonly known as The Cathedral of Vasily the Blessed, in Moscow, Russia, was built by Ivan the Terrible from 1555-1561 and commemorates the capture of Kazan and Astrakhan. The building, now a museum, is officially known as the Cathedral of the Intercession of the Most Holy Theotokos on the Moat. I visited Moscow in November 2004. I saw Lenin’s body in the Mausoleum. It was beautiful city.

St Basil Cathedral and Sky in Moscow

St Basil at Night, Moscow, Russia

St Basil Cathedral Map


Who invented Sudoku ?

Howard Garns (1905 – 1989)

  • Sudoku was invented by Howard Garns, a 74 year old retired architect and freelance puzzle creator, and first published in 1979 by Dell Magazines as Number Place (the earliest known examples of modern Sudoku).
  • The name “sudoku” is abbreviated from the Japanese suuji wa dokushin ni kagiru, which means “the numbers (or digits) must remain single.” Now there are sudoku competitions across the globe, and variations of the puzzle often appear side-by-side the crossword puzzle in newspapers and magazines.