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Figure&nbsp;69 gives a graphical picture of the difference map D''F''&nbsp;=&nbsp;‹D''f'',&nbsp;D''g''› for the transformation ''F''&nbsp;=&nbsp;‹''f'',&nbsp;''g''›&nbsp;=&nbsp;‹((''u'')(''v'')),&nbsp;((''u'',&nbsp;''v''))›.  This depicts the same information about D''f'' and D''g'' that was given in the corresponding rows of the computation summary in Tables&nbsp;66-i and 66-ii, excerpted here:

Figure&nbsp;69 gives a graphical picture of the difference map D''F''&nbsp;=&nbsp;‹D''f'',&nbsp;D''g''› for the transformation ''F''&nbsp;=&nbsp;‹''f'',&nbsp;''g''›&nbsp;=&nbsp;‹((''u'')(''v'')),&nbsp;((''u'',&nbsp;''v''))›.  This depicts the same information about D''f'' and D''g'' that was given in the corresponding rows of the computation summary in Tables&nbsp;66-i and 66-ii, excerpted here:

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|                                                                         |

| Df  = uv. du  dv  + u(v). du (dv) + (u)v.(du) dv  + (u)(v).((du)(dv)) |

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|                                                                         |

| D''f''

| Dg  = uv.(du, dv) + u(v).(du, dv) + (u)v.(du, dv) + (u)(v). (du, dv) |

| = || ''uv''        || <math>\cdot</math> || d''u'' d''v''

|                                                                         |

| + || ''u''(''v'')   || <math>\cdot</math> || d''u'' (d''v'')

| + || (''u'')''v''  || <math>\cdot</math> || (d''u'') d''v''

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| + || (''u'')(''v'') || <math>\cdot</math> || ((d''u'')(d''v''))

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| &nbsp;

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| = || ''uv''        || <math>\cdot</math> || (d''u'', d''v'')

| + || ''u''(''v'')   || <math>\cdot</math> || (d''u'', d''v'')

| + || (''u'')''v''  || <math>\cdot</math> || (d''u'', d''v'')

| + || (''u'')(''v'') || <math>\cdot</math> || (d''u'', d''v'')

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