From:Brilliant <notifications@brilliant.org> Subject:jeff, what is -1 A - 1? Date:Tue, 21 Jun 2016 01:55:59 +0000 Brilliant PROBLEMS OF THE WEEK IR, Image of an interesting problem which contains LaTeX. IR, Image of the possible answers for this problem. See more problems... Brilliant Brilliant Brilliant, 15 Butte PI, San Francisco CA94103 Unsubscribe from receiving Brilliant problems of the week 2-3 times per week (like this one). EFTA00629715 EFTA00629716