v3.9.0

LinearMaps v3.9.0

Diff since v3.8.0

Closed issues:

• AD support (#176)
• Suggestions for debugging a version-dependent DimensionMismatch("") (#189)
• More concise show for maps that combine many maps (#197)

Merged pull requests:

• AD support via chainrules (#177) (@mloubout)
• Add Invalidations.yml (#190) (@ranocha)
• Introduce KhatriRaoMap and FaceSplittingMap (#191) (@dkarrasch)
• Split Quaternion.jl and Octonion.jl (#192) (@dkarrasch)
• Flag derivative WRT map itself as not implemented in chain rule (#198) (@gaurav-arya)
• Prepare for separation of AbstractMatrix & AbstractQ (#199) (@dkarrasch)