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	<title>Demostración del lema auxiliar en la pseudoespiral de Durero.</title>
  

  
  
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		<b>Lema.</b>
			
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								Dada una poligonal abierta $ \{ P_k \}_{{-}\infty}^{{+}\infty}$ en la que  $\dfrac{|\overrightarrow{P_k P_{k+1}}|}{|\overrightarrow{P_{k-1} P_k }|} = m$ y  $\widehat{P_{k-1} P_k P_{k+1}} = \pi - \alpha$, entonces los puntos $P_k$ son puntos de la espiral logarítmica $\large \rho= d \, (m^{\frac{1}{\alpha}})^\theta$.
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