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How to know if the matrix is on-to and one-to-one?! Is there an easy way to know that?!

Mathematics
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onto and one to one are not props of a matrix.they belong to functions
talking about matrix transformations I assume
it also belongs to matrix in linear algebra!

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Other answers:

That's not true, you can assign such properties to any transformation.
http://www.mast.queensu.ca/~spencer/apsc174/11onto.pdf
oh.thanks guys,i'm just a high school level mathematician :)
@TuringTest Can you explain it to me?!
@TuringTest it's all yours :)
I would just go down the checklist for a given transformation is n@Jemurray3; I've never even heard of the term "onto" until recently
I also have class in about 5 min...
Sorry for wasting your time! @TuringTest
not wasted at all, I'll be happy to see other's explanations and save the medal for someone who deserves it !
to check one-to-one, just check if it has only the trivial solution. that is x=0 is the only solution to Ax=0
So when it has only solution Ax = 0, it will be one to one?!
sorry no
ok and if n
the null space must be zero, so no solutions
I get confused
that part is right Ax=0 has not solutions but the trivial one if A is invertable if A is invertable the transformation is one-to-one
has no*
invertible means the det. is not equal zero?
the dimension of the nullspace should be zero...I think even if the dimension of the nullspace is zero, it still contains the zero vector and hence the nullspace can't be zero.. or am I wrong?
right it also implies like 12 other equivalent facts about the matrix
Nullspace is the dimension of the solution space for Ax=0 and the zero vec has no dimension, so I think that is wrong slaaibak I make a lot of mistakes with this stuff too though
:(
Nullspace is the solution space to Ax=0. nullity is the dimension of the nullspace
Then I shall supplement: If we have an nxm matrix, it maps m-dimensional vectors into n-dimensional space. If our transformation is onto, that means that every vector in n-dimensional space is the image of some vector in m-dimensional space under our transformation. Put another way, if we call our matrix A, then we have at least one m-dimensional vector x such that Ax = b for any vector b in R^n. To check for this, try to see if the (m) columns of A span n-dimensional space. I assume you are familiar with the concept of spanning sets, so I'll just say that obviously we must have that m >= n (a necessary, but not sufficient condition). We also require that at least n of the m columns are linearly independent. A one-to-one transformation as stated above means that every vector in m-dimensional space is associated to one and only one vector in n-dimensional space. Therefore, we should be able to go from one vector to another and back with no ambiguity, i.e. the transformation is invertible. For this, we'd need a square matrix whose determinant is not equal to zero.
right
ah damn
am i late?
No
Good explanation JM I'm off to class somebody take away my medals and give them to slai and JM, I don't know why I have the most :/ later guys!
thats nic of u @TuringTest
correct me if I'm wrong, but a 3 * 2 matrix transformation can also be one-to-one? so checking if its invertible is not the only criteria
if it's invertible so it's one-to-one?
non-square matrices aren't invertible.
I know that and if the det is = 0 so it's not invertible
Invertible matrices are one-to-one, yes. And @slaaibak can you come up with an example of one?
how about onto?
1 2 2 1 2 1
This is not one - to -one right?!
Why not? Solve it for Ax=0
It just so happens that invertible matrices are also onto, but a matrix doesn't necessarily HAVE to be invertible in order to be onto.
how can I know if it's onto?
Check if it's consistent for Ax=b. for every b?
@slaaibak good example. Invertibility is a sufficient, but not necessary condition. I'll revise to say linear independence of columns.

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