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The formulation of quantum mechanics on $3N$-dimensional configuration space has been considered unfavourably since the early advent of the theory and is the main source of computational difficulties due to the exponential growth of data with particle number $N$. De Broglie expressed at the 1927 Solvay conference that

“if one wants to physically represent the evolution of a system of corpuscles, one must consider the propagation of $N$ waves in space.”¹⁾

And Schrödinger hoped that

“in the end everything will indeed become intelligible in three dimensions again.”