also known as Heisenberg Uncertainty principle.

Such paired-variables are known as complementary variables or canonically conjugate variables.

Canonical transformation正则变换|form invariance形式不变性

In the published 1927 paper, Heisenberg originally concluded that the uncertainty principle was $ΔpΔq ≈ h$ using the full Planck constant.[1][3][4][5] The formal inequality relating the standard deviation of position $σ_x$ and the standard deviation of momentum $σ_p$ was derived by Earle Hesse Kennard[6] later that year and by Hermann Weyl[7] in 1928:

$$ \sigma_x\sigma_y\ge\frac \hbar 2 $$