What's the definition of canonical divisor(or whatever related concept) on singular curve with nodal point. More generally, what the definition of canonical divisor on a singular variety X, which is the union of 2 smooth varieties intersecting with each other

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divisoron such a variety? (cf. mathoverflow.net/a/46663/10076) $\endgroup$ – Sándor Kovács Nov 26 '19 at 19:38