 after our fruitless attack upon the billy-goat, to proclaim the
| non-lactiferous character of the whole goat-tribe.
|
| William James, 'The Meaning of Truth',
| Longmans, Green, &amp; Co., London, 1909,
| page 12.

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| If W is a submanifold of a manifold Y of class C^p (p &gt;= 1), then the inclusion
|
| i : W -&gt; Y
|
| induces a map
|
| T_w i : T_w(W) -&gt; T_w(Y)
|
| which is in fact an injection.  From the definition of a submanifold, one sees
