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References to 'smooth functions with compact support'
1. $C^\infty_0(U)$ is not empty by matte
2. algebroid structures and extended symmetries by bci1
3. Cauchy principal part integral by mathcam
4. distribution by matte
5. example of Dirac sequence by Johan
6. function space by matte
7. fundamental lemma of calculus of variations by matte
8. weak derivative by paolini