Write the correct answers. Every gap must be filled by one only word. When finished press Check. Pressing the Hint button adds the next correct letter in the answer.

1 - Given a function , D is called the of the function and C is the . 2 - The subset f(D) of C is called the of the function. 3 - If f(D)=C the function is called . 4 - If f(x_{1}) = f(x_{2}) only when x_{1} = x_{2} the function is called . 5 - A function is called bijective if it is both and injective. 6 - A function like f(x)=sign(x) is a function defined in . 7 - A function like f(x)=sign(x) is a non- function. 8 - The set is called the of the function. 9 - An interval like [a,b] is a interval. 10 - An interval like ]a,b[ is an interval. 11 - The real line with the two new elements +∞ and -∞ is called the real line. 12 - The limit is the of a function as x gets to a given point c of the domain. 13 - A point in whose neighbourhoods we can always find other of a set A is called an point for A. 14 - As x tends to the function has no limit. 15 - It makes no sense to calculate the limit of as x tends to 2 because 2 is far from the , or, better, 2 is not an point for the .