# What came first? The Schrödinger equation or commutation relation between $p$ and $x$

Some books like Griffith's begin quantum mechanics with the Schrödinger equation as a postulate while some other text books derive it and state $[x,p]=i \hbar$ as an axiom. I'm not sure which one came first as the operator $\hat{p}$ can be derived from both. Also I'd like to know how did the commutation relation came about because the textbooks I have don't mention about it.

• Basically, Matrix mechanics formulation of quantum mechanics, due to Werner Heisenberg, Max Born, and Pascual Jordan in 1925, and wave mechanics formulated in late 1925, and published in 1926, by Erwin Schrödinger, were independent mathematical formulations of q.m. 1/2 – Mauro ALLEGRANZA Dec 7 '15 at 18:45
• ... "Although Schrödinger himself after a year proved the equivalence of his wave-mechanics and Heisenberg's matrix mechanics, the reconciliation of the two approaches and their modern abstraction as motions in Hilbert space is generally attributed to Paul Dirac, who wrote a lucid account in his 1930 classic The Principles of Quantum Mechanics. " 2/2 – Mauro ALLEGRANZA Dec 7 '15 at 18:45