# How to understand After quantum mechanics, nature itself suddenly became linear?

How to understand Freeman Dyson's Saying:

After quantum mechanics, nature itself suddenly became linear.

• See Freeman Dyson, Birds and Frogs. – Mauro ALLEGRANZA Oct 11 '18 at 10:46
• You tagged the post with linear algebra so you already know about the Hilbert space and matrix formulation (historically as per Heisenberg, as opposed to wave mechanics) and all that. What is your real question? – Lee David Chung Lin Oct 11 '18 at 14:55
• why nature itself became linea? – aircraft Oct 11 '18 at 14:57
• Cum grano salis – sand1 Oct 11 '18 at 16:02
• Equations of classical mechanics are non-linear ODE, equations of quantum mechanics are linear PDE, so metaphorically the non-linear classical nature "became" linear at a more fundamental level. – Conifold Oct 11 '18 at 21:54