It’s important to add that socio-cultural changes have now allowed to diversify tourism, presenting new challenges. One of them is the tourism offer for the elderly people, which is moving the tourism industry, becoming ...

The aim of this chapter is to analyze the relationship between the national systems of social security and senior entrepreneurial activity. To understand the growing phenomenon of senior entrepreneurship, the authors ...

This work deals with the configuration interaction method when an N-electron Hamiltonian is projected on Slater determinants which are classified according to their seniority number values. We study the spin features of ...