例句與造句

1. There are several model structures on symmetric spectra, which have as homotopy the stable homotopy category.
2. Some more recent definitions of spectra, such as symmetric spectra, eliminate this problem, and give a symmetric monoidal structure at the level of maps, before passing to homotopy classes.
3. The technical advantage of the category \ mathcal { S } p ^ \ Sigma of symmetric spectra is that it has a closed monoidal structure ( with respect to smash product ).
4. A variant of symmetric spectra are "'orthogonal spectra "', where one substitutes the symmetric group by the orthogonal group ( see Mandell et al ., 2001 ).
5. They have the advantage that the naively defined homotopy groups coincide with those in the stable homotopy category, which is not the case for symmetric spectra . ( I . e ., the sphere spectrum is now cofibrant . ) On the other hand, symmetric spectra have the advantage that they can also be defined for simplicial sets.
6. It's difficult to find symmetric spectra in a sentence. 用symmetric spectra造句挺難的
7. They have the advantage that the naively defined homotopy groups coincide with those in the stable homotopy category, which is not the case for symmetric spectra . ( I . e ., the sphere spectrum is now cofibrant . ) On the other hand, symmetric spectra have the advantage that they can also be defined for simplicial sets.