Mohammad Alaggan
  • Member for 9 years, 10 months
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Negation of nested quantifiers
Accepted answer
11 votes

I'll start with your last question (in the comments); namely "Why doesn't x = y satisfy the initial problem". The answer is in the quantifiers. Read from left to right. It starts with "there exists" ...

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How to approach Vertical Sticks challenge
3 votes

Expanding on the answer of @Aryabhata: Fix an $i$, and assume the item $y_i$ is at position $j$. The exact value of the height is immaterial, what matters is whether the items are greater than or ...

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Are those definitions of universal hash family equivalent?
0 votes

No they are not equivalent. As a matter of fact, they are not definitions the same thing. The one with the less than or equal sign is called "universal hashing" and the one with the equal sign is ...

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