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WillemienH (talk | contribs) m layout correction link to math stackexchange in comment |
m →Hilberts construction: Typo fixing, replaced: Trough → through using AWB |
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If not, suppose AB < CB'.
Take A' on CB' so that A'B' = AB.
Then s meets s' in an ordinary point D.
Take a point D' on ray AC so that AD' = A'D.
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