$$ {\Large f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\, \mathrm{d}\xi \\ }\\ {\Large \ce{Hg^2+ ->[I-] HgI2 ->[I-] [Hg^{II}I4]^2-} } $$

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