- #1
binbagsss
- 1,259
- 11
What must actually be specified in order for a function to be fully defined / or in what combinations if not all 3 need to be specified?
I.e - from knowing the function you can determine the co-domain - e.g - if it is specified that real functions are going in, and for something simple like 2x + 1 = f(x) - then surely from this you can deduce the co-domain will also be all reals.
- also say if the co-domain and function have both been specified, then given either the domain/range - surely you are able to deduce domain/range accordingly.
- E.g - x^1/2.
Am I correct in thinking that its inverse can only be formed if you either:
- restrict the domain
or
- restrict the codomain
I am pretty certain the 1st option holds, however for the 2nd is my defintion of co-domain correct?
Thanks a lot if anyone will shed some light on this, greatly appreciated :).
I.e - from knowing the function you can determine the co-domain - e.g - if it is specified that real functions are going in, and for something simple like 2x + 1 = f(x) - then surely from this you can deduce the co-domain will also be all reals.
- also say if the co-domain and function have both been specified, then given either the domain/range - surely you are able to deduce domain/range accordingly.
- E.g - x^1/2.
Am I correct in thinking that its inverse can only be formed if you either:
- restrict the domain
or
- restrict the codomain
I am pretty certain the 1st option holds, however for the 2nd is my defintion of co-domain correct?
Thanks a lot if anyone will shed some light on this, greatly appreciated :).