invertible :

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invertible


  • a  having an additive or multiplicative inverse
News & Articles

  • April Showers Bring . . . Awesome Umbrellas
    What's being marketed as the only hands-free/non-invertible umbrella, the Nubrella was featured on ABC's Shark Tank and is now available for pre-purchase for $39.99.The regular price, according to the nubrella web site, is $59.99. A small price to pay for the ability to walk and text in the rain. If doggy raincoats and boots weren't enough, there's also a pet umbrella for sale. The handle of the ...
    April 8, 2014 - Good Morning America via Yahoo! News

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