When was bpt theorem invented?

The BPT (Borsuk-Ulam Theorem) was proven in 1933 by the Polish mathematician Karol Borsuk. It states that any continuous function from an n-dimensional sphere to Euclidean n-dimensional space must have at least one pair of antipodal points that map to the same point. This theorem has significant implications in various fields of mathematics, including topology and combinatorial geometry.