Dialectic compared with demonstration

Dialectical Syllogism: Commonly Accepted and Conceded Premises

AspectDemonstrationDialectic
PremisesCertain propositionsCommonly accepted or conceded
Primary aimCertain knowledgeBind opponent or defend a view
Truth of premisesJustified by demonstrative standardsNot established by acceptance alone
Inference formMust be validMust be valid

Both require a valid inference. The difference is the warrant for the premises and the kind of epistemic result sought.