The deviation from ideality can be described by the compressibility factor Z. This is the thrust of Kant's doctrine of the transcendental ideality of space and time. Deviations from ideality are accommodated by modifying the concentration by an "activity coefficient". Deviations from ideality can be described by the use of Margules functions or activity coefficients. The ideality factor was added to account for imperfect junctions as observed in real transistors. The larger the deviations from ideality the more parameters are required. Convergence to ideality is the most important of these laws. Introducing the ideality factor, n, accounts for recombination and generation of carriers. The most important of these laws involves the ideality of a system. This is the "ideality factor" called "n" above.