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Onward and upward to Flatland, the differential analysis of transformations between 2-dimensional universes of discourse.
 
Onward and upward to Flatland, the differential analysis of transformations between 2-dimensional universes of discourse.
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<pre>
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Consider the transformation from the universe <math>U^\circ = [u, v]</math> to the universe <math>X^\circ = [x, y]</math> that is defined by this system of equations:
Consider the transformation from the universe U% = [u, v] to the
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universe X% = [x, y] that is defined by this system of equations:
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x   =   f<u, v>   =   ((u)(v))
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{| align="center" cellpadding="8" width="90%"
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| <math>x ~=~ f(u, v) ~=~ \underline{((}~ u ~\underline{)(}~ v ~\underline{))}</math>
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|-
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| <math>y ~=~ g(u, v) ~=~ \underline{((}~ u ~,~ v ~\underline{))}</math>
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|}
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y  =  g<u, v>  =  ((u, v))
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The underlined parenthetical expressions on the right are the cactus forms for the boolean functions that correspond to inclusive disjunction and logical equivalence, respectively.  By way of a reminder, consult Table&nbsp;1 on the page at this location:
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The parenthetical expressions on the right are the cactus forms for
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:* [http://stderr.org/pipermail/inquiry/2003-May/000478.html DLOG D1]
the boolean functions that correspond to inclusive disjunction and
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logical equivalence, respectively.  By way of a reminder, consult
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Table 1 on the page at this location:
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DLOG D1.  http://stderr.org/pipermail/inquiry/2003-May/000478.html
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<pre>
 
The component notation F = <F_1, F_2> = <f, g> : U% -> X% allows
 
The component notation F = <F_1, F_2> = <f, g> : U% -> X% allows
 
us to give a name and a type to this transformation, and permits
 
us to give a name and a type to this transformation, and permits
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