For Mokhti from Milan

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Across
  1. 2. hard rock - you are collecting
  2. 4. Synonym of merry
  3. 6. Cher in English
  4. 8. Synonym of festivity
  5. 10. He is considered the Father of Mathematics
Down
  1. 1. Hungarian mathematician - absolute geometry
  2. 3. male godparent
  3. 5. An object is thrown into the air. After a while, it falls back to the Earth. The flight path of the object traces what shape?
  4. 7. Sweetest Museum in Brussels
  5. 9. Serbian inventor best known: alternating current