Working through Hatcher...(adsbygoogle = window.adsbygoogle || []).push({});

For any space X, we have an augmented chain complex

[itex]...\rightarrow C_1(X) \rightarrow C_0(X)\rightarrow \mathbb{Z}\stackrel{\epsilon}{\rightarrow}0[/itex]

Hathcer says that since [itex]\epsilon[/itex] induces a map [itex]H_0(X)\rightarrow \mathbb{Z}[/itex] with kernel [itex]\tilde{H}_0(X)[/itex], we get an isomorphism [itex]H_0(X)\simeq \tilde{H}_0(X)\oplus \mathbb{Z}[/itex]

Where is this isomorphism coming from? I understand where the induced map on [itex]H_0(X)[/itex] comes from...

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Why is homology isomorphic to reduced homology plus Z?

**Physics Forums | Science Articles, Homework Help, Discussion**