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1938 Trans. Amer. Math. Soc. 43 62 One can define product integrals for functions with values in L(G).

1968 P. A. P. Moran Introd. Probability Theory vi. 290 Expressions such as (6.40) are known as ‘product integrals’. This is a mathematical concept which is related to a product of a number of factors in the same way that an integral is related to a sum.