Díaz Díaz, Jesús IldefonsoCasal, Alfonso C.Vegas Montaner, José Manuel2023-06-202023-06-2020091056-2176https://hdl.handle.net/20.500.14352/49901Blow-up phenomena are analyzed for both the delay-differential equation (DDE) u'(t) = B'(t)u(t - tau), and the associated parabolic PDE (PDDE) partial derivative(t)u=Delta u+B'(t)u(t-tau,x), where B : [0, tau] -> R is a positive L(1) function which behaves like 1/vertical bar t - t*vertical bar(alpha), for some alpha is an element of (0, 1) and t* is an element of (0,tau). Here B' represents its distributional derivative. For initial functions satisfying u(t* - tau) > 0, blow up takes place as t NE arrow t* and the behavior of the solution near t* is given by u(t) similar or equal to B(t)u(t - tau), and a similar result holds for the PDDE. The extension to some nonlinear equations is also studied: we use the Alekseev's formula (case of nonlinear (DDE)) and comparison arguments (case of nonlinear (PDDE)). The existence of solutions in some generalized sense, beyond t = t* is also addressed. This results is connected with a similar question raised by A. Friedman and J. B. McLeod in 1985 for the case of semilinear parabolic equations.spajournal articlehttp://www.dynamicpublishers.com/DSA/dsa18pdf/03-DSA-CY-3-Casal.pdfhttp://www.dynamicpublishers.com/restricted access517.9ordinary and partial delay differential equationsparabolic partial differential equationsblow-upAlekseev's formula.Ecuaciones diferenciales1202.07 Ecuaciones en Diferencias