instrumentation

'Structural safety evaluation of Karun III Dam and calibration of its finite element model using instrumentation and site observation' by H. Mirzabozorga, M.A. Hariri-Ardebilib, M. Heshmatia, S.M. Seyed-Kolbadia

Sometimes a change of notation can advance thought. In today's blog the tradition of numerals 6,7,8, and 9 will be challenged. 

Suppose the five letters a, b, c, d, and e are used to represent numbers satisfying

a + 1 = 0,  b + 2 = 0,  c + 3 = 0,  d + 4 = 0,  e + 5 = 0.