I probably miss something basic, unless it's an abstract definition.
[tex]P(X\in [a, b])= \int_a^b f(x)dx[/tex]
where f(x) is the "probability density function".
P(X= a) means [tex]P(X \in [a,a])= \int_a^a f(x)dx= 0[/tex]
Thank you. I guess it's like my initial assumption: "it represents an atomic elelement of the integral and that tends to 0".
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