[antisinguIarity]

>Many of the original mathematical ideas that originated outside the west were simply discarded till somebody in the west came up with the same idea later (sometimes, centuries later) and are credited with the discovery.

Could you name some? It's quite widely known that many ideas in mathematics are centuries (or millennia) old and came from other cultures and geographies. The very name of "algebra" refers to its Arabic roots, and was developed there during a golden era of sophistication and development many centuries ago. Is it a problem that ideas persist and move on, beyond their original geographical and cultural bounds?

Personally, I don't think this is even the issue that the "de-colonise maths" crowd are trying to address. As I see it, this is the supposed root cause of the disparity in math grades between students of various ethnic groups, and the concept of "colonised maths" has been developed backwards from there.