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Mathematics
Mathematics
Problem
Which of the following expressions are meaningful? (a)
u
⋅
(
v
×
w
)
\mathbf{u} \cdot (\mathbf{v} \times \mathbf{w})
u
⋅
(
v
×
w
)
(b)
(
u
⋅
v
)
⋅
w
(\mathbf{u} \cdot \mathbf{v}) \cdot \mathbf{w}
(
u
⋅
v
)
⋅
w
(c)
(
u
⋅
v
)
w
(\mathbf{u} \cdot \mathbf{v}) \mathbf{w}
(
u
⋅
v
)
w
(d)
u
×
(
v
⋅
w
)
\mathbf{u} \times (\mathbf{v} \cdot \mathbf{w})
u
×
(
v
⋅
w
)
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