my favourite (less than insightful) answer is that we live in a (hard) magic world and math then is the language of magic in a literary sense, which can then be

my favourite (less than insightful) answer is that we live in a (hard) magic world and math then is the language of magic in a literary sense, which can then be used to formulate spells in like physic, chemistry, or psychology (we too are magic and can interact with the magic source in our own special way)