Simple-looking math equation leaves people confused - can you solve it in 30 seconds?

An easy-looking equation has proved difficult to solve for many online. Can you remember a golden rule from math lessons to ...
IEEE

Conditions on Decomposing Linear Systems With More Than One Matrix to Block Triangular or Diagonal Form

Abstract: This technical note provides necessary and sufficient conditions to determine that a linear system with more than one matrix in its state-space representation can be decomposed into cascade ...
BMJ

Waist-to-height ratio as an indicator of ‘early health risk’: simpler and more predictive than using a ‘matrix’ based on BMI and waist circumference

Objectives There is now good evidence that central obesity carries more health risks compared with total obesity assessed by body mass index (BMI). It has therefore been suggested that waist ...