Again, math is not the same as philosophy. And *modern* mathematics is quite different than the *arithmetic* that was started in India (and greatly expanded upon by both the Arabic mathematicians and the later European ones)..
Indian mathematics - Wikipedia
Shulba Sutras - Wikipedia
You can see that the numeral system and zero, decimal number system were first developed in India and they expanded upon it to form modern mathematics. This major foundational part apart, they have also made contributions to negative numbers, algebra and arithmetic.
Aryabhata, an Indian mathematician and physicist who lived in the 5th century AD,developed the Aryabhatiya, a compendium of mathematics and astronomy, which was extensively referred to in the Indian mathematical literature and has survived to modern times. The mathematical part of the Aryabhatiya covers arithmetic, algebra, plane trigonometry, and spherical trigonometry. It also contains continued fractions, quadratic equations, sums-of-power series, and a table of sines.
The Aryabhatiya is also remarkable for its description of relativity of motion. He expressed this relativity thus: "Just as a man in a boat moving forward sees the stationary objects (on the shore) as moving backward, just so are the stationary stars seen by the people on earth as moving exactly towards the west."
Aryabhata also correctly stated that the earth rotates about its axis daily, and that the apparent movement of the stars is a relative motion caused by the rotation of the earth, contrary to the then-prevailing view, that the sky rotated. All this in direct contradiction to the prevailing views in Europe then and America now in the Bible belt.
Aryabhata - Wikipedia
In fact, I would say that *modern* mathematics didn't start until Descartes unified algebra and geometry (after the split caused by the discovery of irrationals).
I don't think Descartes could still have started modern mathematics with the roman numeral system.
Don't get me wrong. India had some great mathematicians. Their study of what we know of as Pell's equations were exemplary for the time. The development of the decimal system made basic calculations much easier. But, for example, trigonometry was actually invented by the ancient Greeks. This is why the Indian mathematicians knew about it (it was brought by the Geeks following Alexander).
Geometry is dealt with in the Shulbasutras stemming from the vedic period. It can also be said that the Greeks studied geometry from the Indians from their travels over there.
In fact Pythagoras and Plato have been considered to have travelled to India due to the similarities of their philosophies with the Indians. Pythagoras was a vegetarian and also believed in reincarnation.