@ -78,7 +78,7 @@ The following two theorems can be found in textbooks about homological algebra s
The latter two theorems have a direct consequence for rational homotopy theory. By taking $A =\Q$ we see that the torsion groups vanish. We have the immediate corollary.
The latter two theorems have a direct consequence for rational homotopy theory. By taking $A =\Q$ we see that the torsion groups vanish. We have the immediate corollary.
\Corollary{rational-corollaries}{
\Corollary{rational-corollaries}{
We have the following natural isomorphisms in rational homology, and we can relate rational cohomolgy naturally to rational homology
We have the following natural isomorphisms in rational homology, and we can relate rational cohomology naturally to rational homology
@ -36,3 +36,5 @@ Consider the augmented cdga $V(n) = S(n) \oplus \k$, with trivial multiplication
}
}
From now on the dual of a vector space will be denoted as $V^\ast=\Hom_\k(V, \k)$. So the above lemma states that there is a bijection $[A, V(n)]\iso\pi^n(A)^\ast$.
From now on the dual of a vector space will be denoted as $V^\ast=\Hom_\k(V, \k)$. So the above lemma states that there is a bijection $[A, V(n)]\iso\pi^n(A)^\ast$.