二次曲面几何中的阿基米德方法
The Method of Archimedes in the geometry of quadrics
摘要:
共焦二次曲面捕获(编码)和几何化对称算子的谱特性。共焦二次曲面的某些度量射影性质(其中大多数是在十九$^{\mathrm{th}}$世纪上半叶建立的){ \it通过滚动到并影响曲面{ \it applicable}(等距)到二次曲面和几何上与这些曲面相联系的曲面来实现}(粘贴和转移),从而提供了丰富的可积系统及其解的射影变换。我们将主要遵循比安奇的讨论变形(通过弯曲)的二次曲面。有趣的是,阿基米德的《\it方法》(丢失了7个世纪,在比安奇发现的同一年(1906年)被重新发现,比安奇对此一无所知)适用于《\it方法》的精神和文字,并可能为在其他环境中进行概括提供关键。
英文摘要:
Confocal quadrics capture (encode) and geometrize spectral properties of symmetric operators. Certain metric-projective properties of confocal quadrics (most of them established in the first half of the XIX$^{\mathrm{th}}$ century) {\it carry out} (stick and transfer) by rolling to and influence surfaces {\it applicable} (isometric) to quadrics and surfaces geometrically linked to these, thus providing a wealth of integrable systems and projective transformations of their solutions. We shall mainly follow Bianchi's discussion of deformations (through bending) of quadrics. Interestingly enough, {\it The Method} of Archimedes (lost for 7 centuries and rediscovered in the same year as Bianchi's discovery (1906), so unknown to Bianchi) applies {\it word by word in both spirit and the letter} and may provide the key to generalizations in other settings.
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