# Question from Bott and Tu's Differential Forms book

On page 6 of the introduction, they state

Indeed consider the de Rham theory of $$\mathbb{R}^1$$ with compactly supported forms. Clearly the only function with compact support on $$\mathbb{R}^1$$ is the zero function.

I just started reading about this, so I bet I am missing something. What about bump functions like the ones described here https://en.wikipedia.org/wiki/Bump_function? Don't they contain a compactly supported function defined on the real line?

• Can you take a photo of that Page and post here – Praphulla Koushik Nov 2 at 16:27