1)nonstable homotopy group,非稳定的同伦群2)Stable homotopy group,稳定同伦群3)Stable homotopy groups of spheres,球面稳定同伦群4)nonstable homotopy group,不稳定同伦群5)stable homotopy,稳定同伦6)homotopy group of sphere,球的同伦群
用法例句
To determine the stable homotopy groups of spheres is not only one of the central problems in homotopy theory,but also a very difficult problem.
