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improve formatting of equations; use eta instead of n as in original book |
make equation formatting uniform |
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== Calculation ==
First we need to compute the following numbers, given the program:
* <math>\,\eta_1</math> = the number of distinct operators
* <math>\,\eta_2</math> = the number of distinct operands
* <math>\,N_1</math> = the total number of operators
* <math>\,N_2</math> = the total number of operands
From these numbers, five measures can be calculated:
* Program length: <math>N = N_1 + N_2 \,</math>
* Program vocabulary: <math>\eta = \eta_1 + \eta_2 \,</math>
* Volume: <math>V = N \times \log_2 \eta </math>
* Difficulty : <math>D = { \eta_1 \over 2 } \times { N_2 \over \eta_2 } </math>
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