Sir / Madam,

In geometry, whether the triangle inequality is a + b > c or a + b >= c, where a, b and c are the sides of the triangle.

If we put a + b = c. Then there is no triangle.

However, we say triangle inequality is a + b >= c in vectors and when study complex numbers.

Which one is correct?

kindly explain the difference, if any.

Thanks

with warm regards,

Aranga