数学论文英文

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The pigeon-hole principle's utilization domain is widespread, it is in a combinatorics most cardinal principle, may solve using the pigeon-hole principle many involves the existence combination In the 20th century period, many research are aim at the pigeon-hole principle the promotion, has achieved the crest in the Ramsey Is precisely as a result of the pigeon-hole principle utilization universality, but in view of different type topic explanation method existence very big difference, therefore the pigeon-hole principle's structure method is also many and This article has carried on the reorganization, the summary in view of these methods, has formed seven commonly used structure

Proves Ddesargues theorem with the perspective correspondence method the abstract: Gives in the projective geometry with perspective correspondence's method the Desargues theorem new, the more succinct key word: Projective geometry; Perspective correspondence; Range of points; Group of