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    Excellent. +1 for the no-array version from me too. I'd gone away overnight and done much the same thing with nested \begin{aligned} environments, but this is done better. I forgot to check that I could seperate \left. and \right\{ by alignments characters (&) now that I'd gotten rid of pesky array's The way it's done here minimises \*phantom spacing, and still gets the nice alignment of the equation and the descriptive braces. Commented Jun 16, 2015 at 23:56