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Carl Löndahl
  • Member for 7 years, 1 month
  • Last seen more than a week ago
10 votes
2 answers
903 views

Bouncing ball on a billiard board

11 votes
2 answers
415 views

A curious circuit

12 votes
1 answer
389 views

Fitting the pieces

9 votes
3 answers
399 views

A problem of inequalities