alt Hacker News3 + 2 is just 5. But people will sometimes write 3i + 2j for the point or vector (3, 2), where i is the vector (1, 0) and j is the vector (0, 1).
3 + 2 is just 5. But people will sometimes write 3i + 2j for the point or vector (3, 2), where i is the vector (1, 0) and j is the vector (0, 1).