Dark Patch 135/172,Solve: x²(y-z)p+y²(z-x)q= z²(x-y) | Lagrange's Method of Multipliers,If (x^2 + y^2 + z^2 - 64)/(xy - yz - zx) = –2 and x + y = 3z, then the value of z is,Semantics for a Lambda Calculus for String Diagrams | SpringerLink,PDF) In the Shadows of Poland and Russia: the Grand Duchy of Lithuania and Sweden in the European Crisis of the mid-17th Century. PhD dissertation. Södertörn University, 2006, 347 pp.