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References to 'natural deduction'
1.
$\mathcal{NJ}p$
by
Henry
2.
$\mathcal{NK}p$
by
Henry
3.
from Hilbert's tenth problem to G\"{o}del's trichotomy
by
gribskoff
4.
intuitionistic logic
by
gribskoff
5.
reductio ad absurdum
by
gribskoff
