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nullity of A is the dimension of null space of A.
1 dimension would just be lines in 1 dimension with no width or no length. You wouldn't be able to see it. Pictures on paper are in 2 dimensions. Models in space are in 3 dimensions.
the fifth dimension is space-time, as explained in the book "a wrinkle in time"
A point is a location in space. It has no length, breadth, width or a measure in any higher dimension. The space may contain one or more dimensions.
The space an object takes up or the space inside it