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We get numbers by taking integrals $\\int_{[{\\cal M}_a^{\\rm ss}(\\tau)]_{\\rm virt}}\\Upsilon$ for cohomology classes $\\Upsilon$.\n  Let $\\cal A$ be a $\\mathbb C$-linear abelian category in Algebraic Geometry. 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We get numbers by taking integrals $\\int_{[{\\cal M}_a^{\\rm ss}(\\tau)]_{\\rm virt}}\\Upsilon$ for cohomology classes $\\Upsilon$.\n  Let $\\cal A$ be a $\\mathbb C$-linear abelian category in Algebraic Geometry. 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