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Oct 30, 2016 at 15:08 history edited gnasher729 CC BY-SA 3.0
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Oct 27, 2016 at 19:08 comment added Ben Voigt Initially you have the smallest possible values of \$a^4 + b^4\$ but the largest possible values of \$d^4 - c^4\$ -- you need some serious refinement to this approach before it will let you start eliminating any pairs from consideration.
Oct 27, 2016 at 18:21 history edited Jamal CC BY-SA 3.0
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Oct 27, 2016 at 8:45 history answered gnasher729 CC BY-SA 3.0