Assertion: sub matrix | /r/MadeOf | column
Facets:
Source sentences:
text: Try the square sub-matrix formed by columns 2, 3 and 4: Its determinant is zero.
text: We choose the square sub-matrix formed by columns 1, 2 and 4: Its determinant is also zero.
text: And finally, we choose the square sub-matrix formed by columns 1, 3 and 4: That its determinant is also zero.