Hi All. I may sound weird and I know I am wrong somewhere. But a little explanation would really help. A system with 1 degree of freedom(d.o.f) has 1 governing differential equation. Similarly a system with 2 d.o.f has 2 (coupled) differential equations and so on. But a continuous system has infinite d.o.f so, it should have infinite differential equations. In contrast it has only one governing differential equation. What is wrong in the above logic? Thanks.