Learing a minimal basis set for the hydrogen molecule can help us better understand the concept of basis sets.
This Notebook is guided by Weiliang Luo's Notebook Re: Starting from Scratch in the e-World (I) HF Approximation, STO-3G Basis Set, and SCF Calculation.
Theoretical and algorithmic aspects mainly refer to the following classic textbook: "Attila Szabo, Neil S. Ostlund. Modern Quantum Chemistry. Dover Publications, Inc., 1996."