Last Updated：2025/12/30
Sentence
{{quote-text|en|year=2001|author=Stephanie
Frank
Singer|title=Symmetry
in
Mechanics:
A
Gentle,
Modern
Introduction|page=33|url=http://books.google.com/books?id=MU0fp7nPRB0C&pg=PA33&dq=%22handwave%22&hl=en&ei=35jrTd6VEoruvQPD5_juDw&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEMQ6AEwBTge#v=onepage&q=%22handwave%22&f=false|passage=Some
readers
may
wish
to
handwave
this
restriction
away,
thinking
of
tfrac
∂∂𝜌
as
a
differentiable
vector
field
on
ℝ²
that
behaves
badly
at
the
origin;
this
approach
will
suffice
for
the
purposes
of
this
book.}}
Quizzes for review
{{quote-text|en|year=2001|author=Stephanie Frank Singer|title=Symmetry in Mechanics: A Gentle, Modern Introduction|page=33|url=http://books.google.com/books?id=MU0fp7nPRB0C&pg=PA33&dq=%22handwave%22&hl=en&ei=35jrTd6VEoruvQPD5_juDw&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEMQ6AEwBTge#v=onepage&q=%22handwave%22&f=false|passage=Some readers may wish to handwave this restriction away, thinking of tfrac ∂∂𝜌 as a differentiable vector field on ℝ² that behaves badly at the origin; this approach will suffice for the purposes of this book.}}
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