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Portuguese term or phrase: funções injetoras, sobrejetoras e bijetoras  technical words of mathematics 
  English translation:injective, surjective and bijective functions  Explanation:
função injetora = injective function, or oneone function
função sobrejetora = surjector function, or onto function
função bijetora = bijective function, or oneone onto function
Ao invés de function freqüentemente se usa mapping.
segundo o site www.pinkmonkey.com:
Types of Functions
One  One ( 1  1 ) Function
A function f : A ® B is oneone if different elements of A have different images in B. It is also called 'injection'.
Many  One function
A function f : A ® B is many  one if two or more elements of A have the same in B.
For example f ( x ) = x2, x Î { 1, 1, 2, 2 }.
Onto function ( Surjection )
A function f : A ® B is called an onto function if every element of B is an of some element of A i.e. the codomain = range.
(a) Oneone onto :Oneone onto also known as
(Bijection )bijective mapping or bijective;function.
O site http://www.math.fsu.edu/~aluffi/MGF3301/outline.html apresenta o uso que escolhi para a resposta. 
 Selected response from: Michael Duncan Brazil Local time: 03:10
 Grading comment Thank you very, very much for the help.
If you wouldn't have replied, I would be in troubles!
Many regards,
FSM 4 KudoZ points were awarded for this answer 
 
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3 hrs injective, surjective and bijective functions
Explanation:
função injetora = injective function, or oneone function
função sobrejetora = surjector function, or onto function
função bijetora = bijective function, or oneone onto function
Ao invés de function freqüentemente se usa mapping.
segundo o site www.pinkmonkey.com:
Types of Functions
One  One ( 1  1 ) Function
A function f : A ® B is oneone if different elements of A have different images in B. It is also called 'injection'.
Many  One function
A function f : A ® B is many  one if two or more elements of A have the same in B.
For example f ( x ) = x2, x Î { 1, 1, 2, 2 }.
Onto function ( Surjection )
A function f : A ® B is called an onto function if every element of B is an of some element of A i.e. the codomain = range.
(a) Oneone onto :Oneone onto also known as
(Bijection )bijective mapping or bijective;function.
O site http://www.math.fsu.edu/~aluffi/MGF3301/outline.html apresenta o uso que escolhi para a resposta.
www.pinkmonkey.com (requer senha) Reference: http://www.math.fsu.edu/~aluffi/MGF3301/outline.html
   Grading comment Thank you very, very much for the help.
If you wouldn't have replied, I would be in troubles!
Many regards,
FSM 
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