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V W F α : V → W <br />
v, v1, v2 ∈ V λ ∈ F<br />
α(v1 + v2) = α(v1) + α(v2)<br />
α(λv) = λα(v)<br />
D : D(R) → F (R) = R R f ↦→ f<br />
t<br />
x<br />
0 : C[0, 1] → F [0, 1] f ↦→ x<br />
0 f(t) t <br />
<br />
A m × n α : F n → F m x ↦→ Ax <br />
U, V, W <br />
ιv : V → V, v ↦→ v <br />
U β −→ V α −→ W α, β α ◦ β : U → W <br />
V W F B V α0 : B → W<br />
α : V → W α0 α(v) = α0(v)<br />
v ∈ B<br />
v ∈ V v = λ1v1 + · · · + λnvn vi ∈ B λi ∈ F <br />
α(v) = λiα0(vi) α <br />
V W F α : V → W <br />
V W V → W <br />
F<br />
ιV : V → V <br />
α : V → W α −1 : W → V <br />
U α −→ V β −→ W β ◦ α : U → W