Derivative discontinuities occur frequently in the solutions of delay-differential equations, even when the functions defining them are all C(infinity). Unless correctly treated, such discontinuities can undermine the continuity assumptions made by ODE software. In this paper we discuss some specific difficulties arising from this aspect in the treatment of state-dependent problems. A necessary property, continuity consistency, is introduced along with a class of methods for which it is satisfied.
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Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, BrazilUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, Brazil
Hernandez, Eduardo
Azevedo, Katia A. G.
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Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, BrazilUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, Brazil
Azevedo, Katia A. G.
Rolnik, Vanessa
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Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, BrazilUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preteo, Dept Computacao & Matemat, BR-14040901 Ribeirao Preto, SP, Brazil