añadir primera retraccion
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@ -72,7 +72,13 @@ We can construct $r$ in two steps:
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r:&M_1 & \longrightarrow & M_1\cap\RR^3&\longrightarrow&S_1 \\
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\end{array}
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\end{equation*}
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Let $r_1:M_1 \longrightarrow M_1\cap\RR^3$ and $r_2:M_1\cap\RR^3\longrightarrow S_1$
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Let $r_1:M_1 \longrightarrow M_1\cap\RR^3$ and $r_2:M_1\cap\RR^3\longrightarrow S_1$. Then $r_1$ is given by:
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\begin{equation}
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\begin{array}{ccc}
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r_1: M_1\times I & \longrightarrow & M_1\cap\RR^3 \\
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(x_r+ix_i,y_r+iy_i,z_r+iz_i, t) & \longrightarrow & (x_r+(1-t)ix_i,y_r+(1-t)iy_i,z_r+(1-t)iz_i) \\
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\end{array}
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\end{equation}
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\end{proof}
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\end{document}
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