11. The sign convention used above corresponds to the signs obtained by multiplying two quaternions. 12. This statement by Crawford, for, uses the sign convention of IUPAC, not that of Clausius. 13. Using either sign convention for work, the change in internal energy of the system is: 14. Finally, there would be reports on sign conventions , notation, tolerances and the specification of optical drawings. 15. Some authors use a sign convention for weights that is the negation of that presented here. 16. One is the " half-arrow " sign convention . 17. 1881-Britain persuades Turkey to sign convention with Greece, whereby Greece gets Thessaly and parts of Epirus. 18. For further interoperability, CANaerospace defines aerospace specific axis systems with the corresponding sign conventions and physical units. 19. In the sign convention used in optical design, a concave mirror has negative radius of curvature, so 20. Note however that " in areas of optics other than design ", other sign conventions are sometimes used.
