The question is as stated in the title. What does it mean for a surface to be null homologous? I know that a $p$ cycle of a complex is homologous to $0$ (which I assume is the same as being null homologous) if it the boundary of a $p+1$ chain. But still I cannot figure out what exactly is meant by being null homologous? Any explanation or if you could point me towards a good reference I would much appreciate it. Thank you!
2026-04-06 09:21:51.1775467311
What does it mean for a surface to be null homologous?
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It means that its fundamental class is a boundary for the singular homology.