By partial order method and fixed point index theory, a new computational theorem of topological degree for a non-cone completely continuous mapping is eastablished. As an application, the existence of nontrivial solutions for Hammerstein integral equations is obtained.
LI Zhilong.
COMPUTATIONAL THEOREM OF TOPOLOGICAL DEGREE AND APPLICATIONS. Journal of Systems Science and Mathematical Sciences, 2012, 32(1): 121-128 https://doi.org/10.12341/jssms11780