Why is the rank of this matrix $2$ (solved, thanks)?
62283
How can I quickly know the rank of this / any other matrix?
87494
$\operatorname{rank}(T^3) + \operatorname{rank}(T) \geq 2\operatorname{rank}(T^2)$ for finite-dimensional $V$
57027
Determinant of this skew symmetric matrix
130799
Matrix of rank 1; show that $A^2=cA$ for some scalar $c$.
149629
The Eigenvalues of a block matrix
119301
Is the following matrix invertible?
48660
Proof that determinant rank equals row/column rank
142363
The determinant of a block Matrix of Order $2n$
119435
Rank of the difference of matrices
134402
$\mathrm{rank}(A)+\mathrm{rank}(I-A)=n$ for $A$ idempotent matrix
97487
How to prove whether a matrix has rank $1$
128723
The determinant of adjugate matrix
7612
How can I compute eigenvalues or characteristic polynomial of this matrix? Please help.
20331
Determinant of a $2\times 2$ block matrix
44898
Help with commutative property of matrices problem
104653
$A$ and $B$ are $3\times 3$ real matrices such that $\operatorname{rank}(AB)=1$, then $\operatorname{rank}(BA$) can not be which of the following?
155451
Upper bound for the rank of a nilpotent matrix , if $A^2 \ne 0$