
After several decades of reduced contact, the interaction between physicists and mathematicians in the front-line research of both fields recently became deep and fruit- ful again. Many of the leading specialists of both fields became involved in this devel- opment. This process...

After several decades of reduced contact, the interaction between physicists and mathematicians in the front-line research of both fields recently became deep and fruit- ful again. Many of the leading specialists of both fields became involved in this devel- opment. This process...