The investigation of hochschild cohomology and homology originated from the literature by g . hochschild in 1945 代数的hochschild同调和上同调的研究始于g . hochschild于1945年的文献。
2.
Bringing together two coherent atom beams produces interference ? a pattern of “ bright ” spots ( lots of atoms ) and “ dark ” spots ( with few ) 将两道同调的原子束聚在一起会产生干涉,出现亮点(原子很多)与暗点(原子很少)的图案。