In a paper I'm reading I found some notation I've never seen before. For some functions $f,g$ and $h$ they write $$\delta_f\otimes\delta_g\otimes\delta_h.$$ What does this expression mean? I guess it's pretty standard. Thanks for your help :)
2026-04-02 17:05:20.1775149520
Notation - Tensor product of dirac deltas
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