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nan
  • Member for 9 years, 5 months
  • Last seen more than 4 years ago
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13
When is alternating sum $\sum_{i}f(a_i)-\sum_{i<j}f(a_i+a_j)+\ldots+(-1)^{n-1}f(a_1+\ldots+a_n)$ always positive?
Jun 30, 2015
question
12
Maximize product of sums
Aug 8, 2018
question
11
Connected subgraphs and their sums
Sep 28, 2019
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20
Inclusion-exclusion-like fractional sum is positive?
17
How strict are paper revision deadlines?
8
Probabilities maximizing products
7
Inequality with reciprocals of $n$-variable sums
7
Among $k$ consecutive numbers one has sum of digits divisible by $11$