User talk:JordiGH
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Failed to parse (unknown function "\del"): {\displaystyle \int_a^b f(x) dx = \sum_{x \in X} \oint_{\del x} \omeg}
Failed to parse (unknown function "\del"): {\displaystyle \int_a^b f(x) dx = \sum_{x \in X} \oint_{\del x} \omeg}