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“<strong>La</strong> <strong>matematica</strong> <strong>degli</strong> <strong>indovinelli</strong>” di Matteo Puzzle – <strong>matematica</strong>re@hotmail.com<br />

Mentre attraverso la derivata direzionale si determina la rapidità di aumento in tale<br />

direzione:<br />

( )<br />

2 2 2 2<br />

1⋅<br />

2<br />

P1⋅P<br />

P<br />

2<br />

1<br />

+ P2 ⋅P1⋅P2<br />

⎛ P P ⎞ ⎛ ⎞<br />

∇ ZT<br />

( P1;<br />

P2)<br />

= + =<br />

⎜ P ⎟ ⎜ P ⎟ P⋅<br />

P<br />

⎝ 1 ⎠ ⎝ 2 ⎠<br />

1 2<br />

Fig.1<br />

Fig.2<br />

85

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