Cross Reference: /external/eigen/doc/special

`Name`	`Date`	`Size`
Up to higher level directory
`CMakeLists.txt`	04-Nov-2014	`664`
`Tutorial_sparse_example.cpp`	04-Nov-2014	`1K`
`Tutorial_sparse_example_details.cpp`	04-Nov-2014	`1.5K`

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