EntityQ4338245· pop 5· linked from 13 articlessingular solutionSign in to saveConnectionsalgebraEntitysquare rootEntityderivativeEntitytangentEntitynumber lineEntityordinary differential equationEntitymathematical singularityEntityEncyclopedia of MathematicsEntityenvelopeEntityEuropean Mathematical SocietyEntityPicard–Lindelöf theoremEntityClairaut's equationEntityinitial value problemEntityPeano existence theoremEntityCausticEntityEmden–Chandrasekhar equationEntityCategoriesDifferential equations