Discussion:
f(x,y)=1+a*x+b*y+c*xy is (nearly) a projectivity for large domain
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Thomas Plehn
2017-06-15 13:29:19 UTC
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can you show that the function defined by f(x,y)=1+a*x+b*y+c*xy is (nearly) a projectivity for large domain and small return values
Thomas Plehn
2017-06-15 13:48:14 UTC
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Post by Thomas Plehn
can you show that the function defined by f(x,y)=1+a*x+b*y+c*xy is (nearly) a projectivity for large domain and small return values
more precisely
f_x(x,y)=g*1+a*x+b*y+c*xy
f_y(x,y)=h*1+d*x+e*y+f*xy

for some abcdef,gh
the same as
(x,y)-->(f_x,f_y) is projectivity
or if not possible,
is it nearly the case for large domain and small return values?
Thomas Plehn
2017-06-15 14:12:24 UTC
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Post by Thomas Plehn
can you show that the function defined by f(x,y)=1+a*x+b*y+c*xy is (nearly) a projectivity for large domain and small return values
it should represent a projectivity, which is almost _identity_

is that exact???
Thomas Plehn
2017-06-15 14:13:34 UTC
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Post by Thomas Plehn
can you show that the function defined by f(x,y)=1+a*x+b*y+c*xy is (nearly) a projectivity for large domain and small return values
the return values are the so called offsets to the identity

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