I am a 9th grader self-studying about set theory and functions. I understood most basic concepts, but I didn't understand what is a surjective function. I have understood what is an injective funct...

On topic: Surjective means that every element in the codomain is "hit" by the function, i.e. given a function f: X → Y the image im(X) of f equals the codomain set Y. To prove that a function is …

Jun 16, 2017 · is surjective and seems to contain the same information as f f. But wait, is it really the same? Of course both functions f f and f~ f have exactly the same output when applied to an element …

Understanding the definition of surjective function Ask Question Asked 8 years, 2 months ago Modified 8 years, 2 months ago

I have the same feeling as yours: often, proving that a linear map is injective is easier than proving it is surjective. Of course we are talking about infinite-dimensional vector spaces, otherwise the two are …

What are usual symbols for surjective, injective and bijective functions? I think in one of Lang's book I saw an arrow with 1:1 e.g. A−→1:1 B A → 1: 1 B above it to be understood as a bijective function , …

Sep 11, 2024 · Surjective functions need not possess simply defined inverses, but if you can write down an inverse function that is defined on the entire codomain, then of course the function is surjective. I …

Oct 29, 2020 · Wikipedia uses this picture for injective and surjective functions. The top right is non-surjective. I have added a mapping on, is this now surjective? Why/why not?

For one, you can talk about a function being surjective if the domain and codomain are simply sets, but you cannot talk about a function being continuous unless the domain and codomain are topological …

Jan 4, 2021 · Can you explain if the inverse of a bijective function is always a bijection, and the same for the inverses of a surjection and injection (i.e. is the inverse of a surjective function always surjec...