Changes

→‎C1. Double negation: replace JPG with PNG
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The first theorem goes under the names of ''Consequence&nbsp;1'' <math>(C_1)\!</math>, the ''double negation theorem'' (DNT), or ''Reflection''.
 
The first theorem goes under the names of ''Consequence&nbsp;1'' <math>(C_1)\!</math>, the ''double negation theorem'' (DNT), or ''Reflection''.
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{| align="center" border="0" cellpadding="10" cellspacing="0"
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{| align="center" cellpadding="10"
| [[Image:PERS_Figure_05.jpg|500px]] || (5)
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| [[Image:Double Negation 1.0 Splash Page.png|500px]] || (5)
 
|}
 
|}
  
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