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Joseph O'Rourke
Joseph O'Rourke
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Hi all, I have a question Concerning Beck's theorem. I have read it from http://en.wikipedia.org/wiki/Beck's_theoremBeck%27s_theorem and I have two questions :

  1. I suppose Beck's theorem doesn't hold when instead of saying "at least two points" we take "exactly two points",since there may be lines which do not connect exactly two points at all, right?

  2. In the proof mentioned above, I think the statement that "The lines that connect these pairs either pass through fewer than 2C points, or pass through more than n/C points." is incorrect, it should be "fewer than C points" or more than "2n/C points". Am I right or do I miss some logic here?

thanks

Hi all, I have a question Concerning Beck's theorem. I have read it from http://en.wikipedia.org/wiki/Beck's_theorem and I have two questions :

  1. I suppose Beck's theorem doesn't hold when instead of saying "at least two points" we take "exactly two points",since there may be lines which do not connect exactly two points at all, right?

  2. In the proof mentioned above, I think the statement that "The lines that connect these pairs either pass through fewer than 2C points, or pass through more than n/C points." is incorrect, it should be "fewer than C points" or more than "2n/C points". Am I right or do I miss some logic here?

thanks

Hi all, I have a question Concerning Beck's theorem. I have read it from http://en.wikipedia.org/wiki/Beck%27s_theorem and I have two questions :

  1. I suppose Beck's theorem doesn't hold when instead of saying "at least two points" we take "exactly two points",since there may be lines which do not connect exactly two points at all, right?

  2. In the proof mentioned above, I think the statement that "The lines that connect these pairs either pass through fewer than 2C points, or pass through more than n/C points." is incorrect, it should be "fewer than C points" or more than "2n/C points". Am I right or do I miss some logic here?

thanks

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rose
rose
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On the number of lines of given points

Hi all, I have a question Concerning Beck's theorem. I have read it from http://en.wikipedia.org/wiki/Beck's_theorem and I have two questions :

  1. I suppose Beck's theorem doesn't hold when instead of saying "at least two points" we take "exactly two points",since there may be lines which do not connect exactly two points at all, right?

  2. In the proof mentioned above, I think the statement that "The lines that connect these pairs either pass through fewer than 2C points, or pass through more than n/C points." is incorrect, it should be "fewer than C points" or more than "2n/C points". Am I right or do I miss some logic here?

thanks