Represents the actual value of a symbol identified by its tag
It is the return type of SymbolValue::operator=, and most of the time this is only way it is used.
| SymbolValue (Index val) | |
| Index | value () const | 
| 
 | inline | 
Default constructor from the value val
| 
 | inline | 
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    https://eigen.tuxfamily.org/dox/classEigen_1_1symbolic_1_1SymbolValue.html