WHAT DO WE KNOW ABOUT WAVE FUNCTION NODES?

The following sections are included:

• Introduction

  • Nodes and the Sign Problem

  • The Plan of Attack

  • The Helium Triplet

  • Nodal Conjectures

• Lithium Atom Ground State

• Beryllium Atom

  • Numerical Arguments and Mathematica® Cross-Sections

  • Proof That Four-Electron ¹S Atomic Ground States Have Only Two Nodal Regions

• Conclusions

• References