 Instead, Bohr always stressed that the uncertainty relations are first and foremost an expression of complementarity. This may seem odd since complementarity is a dichotomic relation between two types of description whereas the uncertainty relations allow for intermediate situations between two extremes. They “express” the dichotomy in the sense that if we take the energy and momentum to be perfectly well-defined, symbolically \(\Delta E = \Delta p\) = 0, the position and time variables are completely undefined, \(\Delta x = \Delta t = \infty\), and vice versa. But they also allow intermediate situations in which the mentioned uncertainties are all non-zero and finite. This more positive aspect of the uncertainty relation is mentioned in the Como lecture: