Assalamualikum wa rahmatullahi wabarakaatuhWhat is the ruling on cooperating with some Christians to establish an online centre for answering maths (and phsyics questions)?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

There is no harm in cooperating with Christians or other polytheists in disseminating useful worldly sciences, such as math, physics, etc, whether by establishing a website or by printing a book or other means of disseminating knowledge.

The principle in this is that it is permissible and not prohibited, while, of course, being keen on not publishing what is contrary to the Islamic Creed.

Allah knows best.