#1**+16 **

Best Answer

This is a linear equation.....I can substitute any real value in for "n" (the domain) and get back any real number (the range).

So, rhe domain and range is just (∞, ∞)

CPhill
Jun 4, 2014

#2**+5 **

Hang on a minute. how can this have a domain and range?

It is not an equation it doesn't even have a y value.

It is just an expression.

Maybe it is me that is wrong. Can other mathematicians arbitrate please?

Melody
Jun 5, 2014

#3**0 **

Well...if we put in any real number for n...don't we get a real number back?? And since we can return any real number we want...that's what I was getting at.....the "y" is implied..

CPhill
Jun 5, 2014

#4**0 **

Sorry...I meant to type "function" rather than "equation".....I'll stand by the rest...

CPhill
Jun 5, 2014

#5**0 **

Yes maybe - I'm not sure.

I knew that is what the question was implying but I'd still like to know what other mathematicians think.

It is a lot better now that you have changed the word equation to function. You are probably right.

Melody
Jun 6, 2014

#7**+8 **

Yes I know functions and relations have domains and ranges but this has no equal sign.

Techically speaking - does it really have a domain and a range. To me it is just an expression.

(I know an equal sign and a y or f(n) is implied BUT it is not really there!)

I know I am being padentic but mathematics is a padentic field of study!

Melody
Jun 7, 2014

#8**+5 **

Quiet, whippersnapper!!! Things are what we say they are !!!

I'll get you, my pretty...and your little dog, too!!

CPhill
Jun 7, 2014

#9**+8 **

It's when you are reduced to threats and witchcraft that I KNOW I am in the lead!!!!!

Melody
Jun 7, 2014

#10**0 **

Even though the function might not be defined in the sense of f(n) = 80n-275, it still maps R->R which even though it is an undefined function still has a domain and range. The question here is not whether or not this function has a domain and range, but rather whether it's a mathematical fallacy to have an undefined function.

reinout-g
Jun 7, 2014