--- title: "Magma V2.18-3 Patch Notes" canonical: "https://docs.magma-maths.org/patchnotes/2.18-3.html" source: "https://docs.magma-maths.org/patchnotes/2.18-3.md" --- # Magma V2.18-3 Patch Notes ## Algebras - A crash to do with generators of a 0-dimensional algebra has been fixed. Reported by S. Humphries. ## Basics - The output of `ContinuedFraction` is properly truncated, and the function no longer uses PARI. Reported by M. Bright. ## Function Fields - The comment for the `Completion` intrinsics has been expanded to explain the precision used. The `Precision` parameter is now available for `Completion` of fields and orders in relative representation. ## Groebner Bases - A crash in `GroebnerBasis` with the `PairsLimit` parameter has been fixed. Reported by W. Whistler. - A problem in `Variety` where the second argument is a complex field has been fixed. Reported by C. Zickert. ## Groups - A crash when constructing a homomorphism from a matrix group to an automorphism group has been fixed. Reported by D. Holt. - The name of the maximal subgroup of order 1081 of the Baby Monster group (as returned by [`MaximalSubgroupsData`](../FiniteGroups/AlmostSimpleGroups/related.md#function-maximalsubgroupsdata-monstgelt)) has been corrected to 47:23. Reported by M. Giudici. - A bug in the [`IsolProcess`](../FiniteGroups/DatabasesOfGroups/isolgps-database.md#function-isolprocess) family of functions has been fixed. Reported by A. Kasprzyk. - A bug in isomorphism testing between PC groups was resolved. - Many improvements to the p-group automorphism group code were made, particularly for large examples. - A crash computing `LowIndexSubgroups` of a Coxeter group represented as a permutation group has been fixed. Reported by Stefan Elsenhans. - There is a new access function for automatic groups: [`WordDifferences`](../FinitelyPresentedGroups/AutomaticAndHyperbolicGroups/automatic-groups.md#function-worddifferences-grpatc). This returns the sequence of words labelling the states of the word difference machine of the group. - Magma level printing of an automatic group is now supported. - A bug in [`ClassicalMaximals`](../FiniteGroups/AlmostSimpleGroups/properties-lie-groups.md#function-classicalmaximals-monstgelt-rngintelt-rngintelt), with classes set to {6} and the normaliser option true, has been fixed. Reported by M. Giudici, fixed by D. Holt. - The optional database with transitive group identification data for degree 32 `[Trn32IdData.tar.gz]` is now available. - A bug in computing the inverse of an endomorphism of a free fp-group has been fixed. Reported by E. O’Brien. ## Lattices - Some bugs in G-lattices and `()` for lattice elements have been fixed. ## Linear Programming - The printing (both normal and verbose) of LP processes has been improved. ## Number Fields - [`ClassGroupCyclicFactorGenerators`](../GlobalFields/NumberFieldsAndOrders/ideal-class-group.md#function-classgroupcyclicfactorgenerators-rngord) has been fixed when the class group map is not completely computed. - Improve algorithm selection for `Subfields` of a number field in absolute representation. - Calculation of generators of principal ideals has been improved when such generators are large. ## Polynomial Rings - `Norm` of a polynomial over a field whose defining polynomial is not over its coefficient field has been fixed. Reported by D. Gru. ## Schemes - The base ring of an ambient space is now printed with the ambient. ## System - Objects of type `Process` now have a parent and may consequently be used in sequences.