Answer:
Manuscripts and verbal via transportation.
Explanation:
India made great mathematics contribution by giving the concept of zero, negative Numbers, the study of trigonometry, arithmetic, algebra and some other areas.
Also the decimal system that is used by the world today originated from India. These mathematical concepts where first transmitted to the middle East, China, Europe and later to all part of the world. It was spread orally and later through manuscripts.
Through manuscripts,other scientist were able to see it, develop and adopt India mathematical concepts though it took while before some scientist in Europe could accept it.
As people migrate then, manuscripts was spread to other parts of the world and mathematicians all round were able to see it.
It spread to manuscript via transportation.