# Many atoms per unit cell 1.1

**URL:** https://forum.solidstate.quantumtinkerer.tudelft.nl/t/many-atoms-per-unit-cell-1-1/3810
**Category:** Uncategorized
**Created:** [May 14, 2026, 6:33pm UTC](https://forum.solidstate.quantumtinkerer.tudelft.nl/t/many-atoms-per-unit-cell-1-1/3810 "2026-05-14T18:33:03Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![hajoW](https://forum.solidstate.quantumtinkerer.tudelft.nl/letter_avatar_proxy/v4/letter/h/46a35a/32.png) [@hajoW](https://forum.solidstate.quantumtinkerer.tudelft.nl/u/hajoW)
#### Post date: [May 14, 2026, 6:33pm UTC](https://forum.solidstate.quantumtinkerer.tudelft.nl/t/many-atoms-per-unit-cell-1-1/3810/1 "2026-05-14T18:33:03Z")

</div>

I think it would really help when in the last part the |sin(ka/4)| part above, would be switched with the |cos(ka/4)| below since then it would correspond correctly with the + part and the - part of the equation before. This took a while to understand for me.

 ![image](https://forum.solidstate.quantumtinkerer.tudelft.nl/uploads/default/original/2X/a/a516624d4b91ed0433597bf5ab9978943bb2d016.png)

---

<div class="post-metadata">

### Author: ![anton-akhmerov](https://forum.solidstate.quantumtinkerer.tudelft.nl/user_avatar/forum.solidstate.quantumtinkerer.tudelft.nl/anton-akhmerov/32/5_2.png) [@anton-akhmerov](https://forum.solidstate.quantumtinkerer.tudelft.nl/u/anton-akhmerov)
#### Post date: [May 14, 2026, 7:52pm UTC](https://forum.solidstate.quantumtinkerer.tudelft.nl/t/many-atoms-per-unit-cell-1-1/3810/2 "2026-05-14T19:52:31Z")

</div>

Thanks for reporting! I now fixed the ambiguous notation in the solution.