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===Frequently used theorems===
 
===Frequently used theorems===
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====C<sub>1</sub>.  Double negation theorem====
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====C<sub>1</sub>.  Double negation====
    
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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