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How many pages are in Principia Mathematica?
Principia Mathematica was written by Sir Isaac Newton. It has 518 pages in the edition by Albert North Whitehead and Bertrand Russell. This is the electronic one. The reviews complained that it was a poor scan.The print version of book translated by Andrew Motte had five stars and the electronic one only had one star.
When did William A. Russell die?
William A. Russell died in 1899.
What is a fact family with only facts?
There cannot be such a family because of self-reference. It is similar to the Russell paradox (named after Bertrand Russell). As soon as you have a fact family with only two facts, you have added a third fact. The third fact is that is that the fact family had only two facts. That then makes it a family with three facts. Which means it is no longer a fact family with only two facts. So the third fact is no longer correct. And so it does not have three facts. Which means it has only two facts and you will keep looping round and round forever!
Who created the Hertzsprung-Russell diagram?
The Hertzsprung-Russell diagram was created - as the name suggests - by Ejnar Hertzsprung and Henry Norris Russell in 1910
Can you always find a prime number between any number and its double?
Yes, if you take the range to be inclusive, it even works for 1, since 2 is prime. The theorem related to this question is called Bertrand's Postulate, or Chebyshev's Theorem, or the Bertrand-Chebyshev theorem.
