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Revision as of 20:26, 8 April 2009
, 20:26, 8 April 2009→Selection 10
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Line 2,633:
−: <p>'x' + 'x' = !2!.'x'</p>+ + +: <p>'x',<sub>∞</sub> + 'x',<sub>∞</sub> = !2!.'x',<sub>∞</sub></p>+
==Selection 10==
==Selection 10==
+
+===The Signs for Multiplication (cont.)===
{| align="center" cellspacing="6" width="90%" <!--QUOTE-->
{| align="center" cellspacing="6" width="90%" <!--QUOTE-->
|
|
−<p>'''The Signs for Multiplication''' (cont.)<p>
+<p>The sum <math>x + x\!</math> generally denotes no logical term. But <math>x,_\infty + \, x,_\infty</math> may be considered as denoting some two <math>x\!</math>'s.</p>
−<p>The sum 'x' + 'x' generally denotes no logical term. But 'x',<sub>∞</sub> + 'x',<sub>∞</sub> may be considered as denoting some two 'x's.</p>
<p>It is natural to write:</p>
<p>It is natural to write:</p>
−{| width="100%"
−| width="10%" |
−<p>and</p>
+| align="center" | <math>x + x ~=~ \mathit{2}.x</math>
−| width="10%" |
−|-
+| <p>and</p>
+| align="center" | <math>x,_\infty + \, x,_\infty ~=~ \mathit{2}.x,_\infty</math>
+|
+|}
<p>where the dot shows that this multiplication is invertible.</p>
<p>where the dot shows that this multiplication is invertible.</p>
