BUILT-IN MATHEMATICA SYMBOL
C
C[i]
is the default form for the 
parameter or constant generated in representing the results of various symbolic computations.
- The C[i] are often used to parameterize families of solutions to equations.
- In functions like DSolve, the C[i] can be thought of as corresponding to constants of integration.
- In cases such as partial differential equations, the C[i] represent functions rather than variables.
- C is the default setting for the option GeneratedParameters in such functions as DSolve, RSolve, and Reduce.
Parameters generated by Reduce:
| Out[1]= |  |
Parameters generated by DSolve:
| Out[1]= |  |
Parameters generated by RSolve:
| Out[1]= |  |
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