--- title: "Magma V2.15-15 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.15-15.html" source: "https://docs.magma-maths.org/patchnotes/2.15-15.md" --- # Magma V2.15-15 Patch Notes ## Algebras - Orders of algebras over number fields constructed from a ring and a sequence of algebra elements now store their ideals as all other orders over orders do. ## Commutative Algebra - [`FittingIdeal`](../CommutativeAlgebra/ModulesOverMultivariateRings/operations.md#function-fittingideal-modmpol-rngintelt) now handles the zero ideal properly. Reported by E. Rains. - Some bugs in modules over local polynomial rings have been fixed. Reported by E. Rains. - The simple convenience function `Degree` has been added for a homogeneous ideal in a polynomial ring with all variables of weight one. ## EllipticCurves - In [`IsogenyFromKernel`](../ArithmeticGeometry/EllipticCurves/morphism.md#function-isogenyfromkernel-schgrpell), the case of the entire curve as the kernel subgroup scheme has been properly disallowed. This previously resulted in crashes over finite fields. ## Integer Ring - In the ECPP algorithm, the internal parameters have been changed again to avoid failures that occurred when verifying primality of certain smallish primes in `IsPrime` or [`PrimalityCertificate`](../BasicRings/Integers/prime.md#function-primalitycertificate-rngintelt). Examples of failure reported by J. Kimberley. ## Language - A crash when deleting huge numbers of variables in one go has been fixed. Reported by M. Kirschmer. ## Lazy Power Series - In [`PrintToPrecision`](../LocalFields/LazyPowerSeriesRings/elements.md#function-rnglaz-printtoprecision), a newline has been added after the printout of a lazy power series. Problem reported by M. Grassl. ## ModularCurves - [`IsModularCurve`](../AlgebraicGeometry/Schemes/schemes-types.md#function-ismodularcurve-sch) has been changed to a basic intrinsic that simply returns whether a scheme is of type CrvMod or not. Problem reported by Jean-Marie Maillard. ## Module Theory - Some bugs involving zero modules have been fixed. Reported by E. Rains.