Talk:Foundations of Computational Materials Science/Introduction to Quantum Mechanics

Why doesn't the ${{\Lambda }_{n}}{{E}_{n}}{{\phi }_{n}}$ part wanishes? It is on both sides.

Where does ${\frac {m}{{M}_{I}}}\int _{{V}^{N}}{\left(\phi _{k}^{*}{{\nabla }_{{\mathbf {R} }_{I}}}{{\phi }_{l}}{{d}^{3N}}r\right)}{{\nabla }_{{\mathbf {R} }_{I}}}$ come from?