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I want to buy a physical edition of Arkfen's Mathematical Methods for Physicists. Seventh edition is listed at 100 USD. A friend is selling his Second edition for 35 USD. Is it worth to buy the second edition, or should I buy the newest one?

Edit: I do not live in the USA

IchVerlore
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  • $35 for a 2nd edition seems a bit high- you can find copies for sale online for much less. However, it's really a matter of opinion whether the newer editions offer a substantial benefit. – Brian Borchers Dec 24 '18 at 06:10
  • https://www.abebooks.com/Mathematical-Methods-Physicists-Arfken-Weber-Harris/30183584060/bd?cm_mmc=gmc--new--PLA-_-v01&gclid=Cj0KCQiAgf3gBRDtARIsABgdL3n6Se2AICxnz9nDRu8HDcJfthMqt0x3dis3HFwfkAQFdZhDn3TufFgaAmUiEALw_wcB – John Douma Dec 24 '18 at 06:23

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