Since 1893, Picard [19] introduced lower and upper solutions to prove the existence of solutions for separated boundary value problems associated with scalar second-order ordinary differential equations. The theory was later developed by Nagumo [20] in the 1930s into differential inequality theory ...
into many equations, and city planners, corporate cemetery stockholders and their insurers are only now beginning to appreciate the expense accruing as they run out of space and are faced with tighter regulatory controls on the burial and discharge of pollutants and nondegradables into the ...
Whether rich or poor, we all have problems: that unfaithful mate, that annoying colleague, that persistent(持久的) disease, and the investment that is turning into a huge loss.How can we remain calm, positive and even elegant in the face of all these difficulties oflife?
linear differential equations associated with the fourth Painlev´e equation. PACS numbers: 1 As is pointed out by Silverstone [1], notorious ambiguities in the connection problems in WKB theory are resolved if we make use of the Borel resummation method; in a word, we have to first ...
Physical model methods have achieved a significant success in the simple turning process based on accurate mathematical equations. However, when the turning process becomes increasingly complex, rapidly increasing cutting constraints and finite search capabilities limit the application of physical model ...