Related Clues:

• ''Cogito ___ sum''
• 'Cogito, -- sum': Descartes
• Logical lead-in
• Deducer's word
• 'Thus ...'
• Sum lead-in
• Logician's connector
• "Cogito ___ sum"
• 'And so ...'
• Thus, in mathematical proofs
• Thus, to a logician
• Cogito follower
• And so . . .
• Apt rhyme for "so"
• Descartes' adverb