Categories: All - vectors - properties - addition

by Soufiane Fardi 12 years ago

213

VM270-8298

The text outlines several fundamental properties of vectors and subspaces in linear algebra. It includes propositions that define the behavior of the zero vector, demonstrating that adding or scaling by zero yields zero.

VM270-8298

VM270-8298

Chapter 1

Prop 1.9
V = U ⊕W if and only if V = U +W and U ∩W = {0}
Prop 1.8
(a) V = U1 + · · · + Un; (b) the only way to write 0 as a sum u1 + · · · + un, where each uj ∈ Uj , is by taking all the uj’s equal to 0.
Prop 1.7
U +W = {(x,y, 0) : x,y ∈ F}
Prop 1.6
v + (−1)v = 1v + (−1)v = 1 + (−1)v = 0v = 0
Prop 1.5
a0 = a(0 + 0) = a0 + a0
Prop 1.4
0v = (0 + 0)v = 0v + 0v
Prop 1.3
w=w+0=w+(v+w′)=(w+v)+w′ =0+w′ =w′
Prop 1.2
0′ = 0′ + 0 = 0