Exercise · ZW-BASIS-AND-DIMENSION-002 · ★☆☆ Basic
Which of these sets is a basis of \(\mathbb{R}^2\)?
Choose one option.
Show answer
- A. \(\{(1,1),(1,-1)\}\)
Explanation
They are independent and, being two in dimension 2, they span. The others are dependent.
Review the concept: Basis and dimension
A basis \(\mathcal B\) of a vector space \(V\) is a linearly independent set that spans it; its number of vectors is the dimension of \(V\).
\[\mathcal{B}=\{v_1,\dots,v_n\},\quad \dim V=n\]
More practice problems: basis and dimension
- ZW-BASIS-AND-DIMENSION-001 What is the dimension of ℝ^4?
- ZW-BASIS-AND-DIMENSION-003 How many vectors does any basis of ℝ^3 have?
- ZW-BASIS-AND-DIMENSION-004 Write (5,1)=a(1,1)+b(1,-1). What are a and b?
- ZW-BASIS-AND-DIMENSION-005 What is the dimension of the plane x+y+z=0 in ℝ^3?
- ZW-BASIS-AND-DIMENSION-006 What is the dimension of the span of (1,2,3), (2,4,6) and (0,1,0)?
- ZW-BASIS-AND-DIMENSION-007 What is the dimension of the space of polynomials of degree at most 3?
- ZW-BASIS-AND-DIMENSION-008 What is the dimension of the space of 2× 3 matrices?
- ZW-BASIS-AND-DIMENSION-009 If dim V=n and S is a linearly independent set of n vectors of V, then: