math.matrices.elimination: avoid double length call.
math.matrices.elimination: avoid double length call.

slavapestov/factor,slavapestov/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,slavapestov/factor,tgunr/factor,mrjbq7/factor,factor/factor,bpollack/factor,bjourne/factor,bpollack/factor,nicolas-p/factor,mrjbq7/factor,factor/factor,slavapestov/factor,AlexIljin/factor,bjourne/factor,tgunr/factor,bjourne/factor,tgunr/factor,factor/factor,factor/factor,bpollack/factor,AlexIljin/factor,bpollack/factor,slavapestov/factor,mrjbq7/factor,AlexIljin/factor,mrjbq7/factor,nicolas-p/factor,nicolas-p/factor,AlexIljin/factor,factor/factor,slavapestov/factor,slavapestov/factor,nicolas-p/factor,bjourne/factor,bpollack/factor,bpollack/factor,bjourne/factor,nicolas-p/factor,nicolas-p/factor,bjourne/factor,factor/factor,AlexIljin/factor,tgunr/factor,tgunr/factor,nicolas-p/factor,AlexIljin/factor,bjourne/factor,AlexIljin/factor