See more HERE: https://www.sunfrog.com/trust-me-im-an-engineer-NEW-DESIGN-2016-Black-Guys.html?53507 Derivative and Anti-Derivative Cheat Sheet. Check out that cool T-Shirt here:  https://www.sunfrog.com/trust-me-im-an-engineer-NEW-DESIGN-2016-Black-Guys.html?53507

See more HERE: Derivative and Anti-Derivative Cheat Sheet. Check out that cool T-Shirt here:

13 графических диктантов, которые будут полезны и детям, и взрослым

13 графических диктантов, которые будут полезны и детям, и взрослым

The Journal of Recreational Mathematics published this remarkable magic square, composed by “a puzzlist who at the time was a prison inmate.”    The large 13 x 13 square is magic — that is, each row and column adds to the same sum — but so is each successive nested square, from 11 x 11 down to 3 x 3.    The magic constant of each square is 10,874 smaller than the last.    And every cell is prime.

The total 13 × 13 square is magic (every row and column adds to the same sum), but so is each successive nested square, from 11 × 11 down to 3 × and their magic constants form an arithmetic progression. Last but not least, every cell is prime.

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