- #1
robierob12
- 48
- 0
Im stuck on this proof.
Let A and B be nxn matricies such that AB is singular. Prove that either A or B is singular.
Sooooo, here we go.
Let M = AB where is M is the given singular matrix.
Becuase M is singular then
Mx=0 has an infinite amount of solutions.
Let J be one of the non zero solutions
Mj=0
ABj=0
this is where I get stuck.
If knew that B was singular I think I could prove M is singular but I am having trouble from this way around.
Any ideas?
Let A and B be nxn matricies such that AB is singular. Prove that either A or B is singular.
Sooooo, here we go.
Let M = AB where is M is the given singular matrix.
Becuase M is singular then
Mx=0 has an infinite amount of solutions.
Let J be one of the non zero solutions
Mj=0
ABj=0
this is where I get stuck.
If knew that B was singular I think I could prove M is singular but I am having trouble from this way around.
Any ideas?