When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
By R.P. Agarwal, Donal O'Regan. As one might expect general existence results were difficult to establish for the problems which arose. However in the 1990's new results in inequality and fixed point theory were used to present a very general existence theory for singular problems.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.