obvert
/ɑbˈvɜrt/
verb
- To turn something so that the opposite side or aspect is presented.
- She obverted the coin to show the eagle on the reverse.
- He obverted the painting to reveal the sketch on the back.
- The teacher asked the class to obvert the statement into its logical equivalent.
- In logic, to transform a proposition by obversion.
- You can obvert any standard-form categorical statement.
- To obvert 'All cats are mammals,' you say 'No cats are non-mammals.'
- The student learned how to obvert categorical propositions.