See Convolution theorem for a derivation of that property of convolution. Below is the mathematical derivation and application of this method. See estimation of covariance matrices for details on the derivation. The etymology is a simple derivation from "actor" with added. Inflection is also present in adjective comparation and word derivation. The initial derivation of AIC relied upon some strong assumptions. See activity coefficient for a derivation of this expression. For the full derivation see Modern portfolio theory. The dictionary does not mention any specific derivation. Now switch to indicial notation for the ease of derivation. Keyed cryptographic hash functions are popular examples of pseudorandom functions used for key derivation. Nonetheless, it is worth reviewing those definitions before leaping into the derivation of our models. The derivation of this word remains uncertain. All of the derivation for the algorithm is done. The further derivation of this form is uncertain.