Question: I give up. Help on searching the dsolve option "differential" needed

I found the option in this statement

dsn := dsolve(dsys, numeric, differential = true, projection = false, maxfun = 0)

in help("examples/numeric_DAE")

 

I give up searching because

  • the word "differential" occurs so often in dsolve help pages that advanced search does of not filter help topics effectively
  • the option does not seem to be a dsolve[numeric] or rk45 specific option (at least I cannot find anything on the pages)

What does the option do?
How could I have searched better?

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