teoría de cordes: principis básics

coeficients fonamentals:
E = d_{u}[x(u,v)]·d_{u}[x(u,v)]
F = d_{u}[x(u,v)]·d_{v}[x(u,v)]
G = d_{v}[x(u,v)]·d_{v}[x(u,v)]


teoría hetero-tópica:
x(u,v) = f(h)·( e^{iu}+e^{iv} )
d_{u}[x(u,v)] = f(h)·ie^{iu}
d_{v}[x(u,v)] = f(h)·ie^{iv}


teoría hetero-elíptica:
x(u,v) = f(h)·( u^{(n+1)}+v^{(n+1)} )
d_{u}[x(u,v)] = f(h)·(n+1)·u^{n}
d_{v}[x(u,v)] = f(h)·(n+1)·v^{n}