1. The problem statement, all variables and given/known data Already it is on title !!! 2. Relevant equations attachents provide the most relevant equations i could find. 3. The attempt at a solution I have found some old books written in 1920 decade ,dealing with this subject,but the solution they provide seems very hard understand,although it might be correct. http://books.google.co.uk/books?id=...e&q=helium ground state eigenfunction&f=false i have in my possesion proof of the formula for the expectation energy of helium atom. But i dont know if and how could this be related to the ground state eigenfunction. i cant really provide more relevant formulas ,but it must be appreciated that this is not an easy problem.