https://scholarsarchive.byu.edu/etd/5801/
"Conjugate Heat Transfer and Average Versus Variable Heat Transfer Coef" by Tyler James Macbeth
An average heat transfer coefficient, h_bar, is often used to solve heat transfer problems. It should be understood that this is an approximation and may...
heat transfer
https://www.php.net/manual/en/function.stats-stat-binomial-coef.php
PHP: stats_stat_binomial_coef - Manual
Returns a binomial coefficient
phpstatsbinomialcoefmanual