| 000 | 00602nam a2200145 4500 | ||
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| 999 |
_c13314 _d13314 |
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| 008 | 190228b ||||| |||| 00| 0 eng d | ||
| 022 | _a0746-8342 | ||
| 082 | _aDPer 510.5 C697 Jan 2012-Sept 2015 v. 43 & 46, n. 1-4 | ||
| 100 |
_aNelsen, Roger B. _937219 |
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| 245 |
_aProof without words: _beach but two triangular numbers is a sum of three triangular numbers/ _cRoger B. Nelsen. |
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| 260 |
_aWashington D. C.: _bMathematical Association of America, _ccJul 2012-Sept 2015. |
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| 300 |
_av43 n3, page 172: _bIllustrations; _c25 cm. |
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| 650 |
_aMathematics _xTriangular number. _937220 |
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| 942 |
_2ddc _cPER |
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