Let U1, U2, U3 – be the following subspaces of R4   U1={a, b, c, d) R4| 1b=с; a=d=0};   U2={(a, b, c, d) R4| a - b + 2c + 3d=0, -a +b - 2c - 3d=0};   U3= {a, b, c, d) R4| 1a – 2b – 1c - d=0, a + 2b + 0c + 2 d=0 };   Sub-Task 1. Find a basis and the dimension of U1.  Sub-Task 2. Find a basis and the dimension of U2.  Sub-Task 3. Find a basis and the dimension of U3.  Sub-Task 4. Whether R4=U1+U2, (provide a justification). Whether R4=U1 U2, (provide a justification). Sub-Task 5. Whether R4=U1+U3, (provide a justification). Whether R4=U1 U3, (provide a justification).   Sub-Task 6. Whether R4=U2+U3, (provide a justification). Whether R4=U2 U3, (provide a justification)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let U1, U2, U3 – be the following subspaces of R4  

U1={a, b, c, d) R4| 1b=с; a=d=0};  

U2={(a, b, c, d) R4| a - b + 2c + 3d=0, -a +b - 2c - 3d=0};  

U3= {a, b, c, d) R4| 1a – 2b – 1c - d=0, a + 2b + 0c + 2 d=0 };  

Sub-Task 1. Find a basis and the dimension of U1

Sub-Task 2. Find a basis and the dimension of U2

Sub-Task 3. Find a basis and the dimension of U3

Sub-Task 4. Whether R4=U1+U2, (provide a justification). Whether R4=U1 U2, (provide a justification).

Sub-Task 5. Whether R4=U1+U3, (provide a justification). Whether R4=U1 U3, (provide a justification).  

Sub-Task 6. Whether R4=U2+U3, (provide a justification). Whether R4=U2 U3, (provide a justification).

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