To be fair, what he needed was actually DOMAIN knowledge, in this case, some specific math stuffs. Unfortunately, unlike other domain knowledge such as business

To be fair, what he needed was actually DOMAIN knowledge, in this case, some specific math stuffs. Unfortunately, unlike other domain knowledge such as business workflow, stuffs like Math and Physics are kind of hard-core, can not be quickly picked up by self-learning. He should have had some domain experts (mathematicians) to help him.