Lessons from a Math Professor

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Across
  1. 1. They learn this in high school in Romania
  2. 4. Anecdotally, this can never be deleted (two words)
  3. 6. Phrase used to "describe" any mathematical object: ______ to goodness
  4. 8. Comes before Z (three letters)
Down
  1. 2. It's never free!
  2. 3. Precedes either "math" or "it's cold outside"
  3. 4. The Glee Club Fall Show (adj.)
  4. 5. A large number: for example, ___ to the ___ to the ____(one word)
  5. 7. There are ___ things even God can't change