# spin liquids with and without have (geometrical) frustrations?

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It seems to me that the spin ice and spin glass require the [(geometrical) frustration](https://en.wikipedia.org/wiki/Geometrical_frustration) due to the incompatibility between the interactions/couplings and the geometry of lattice structure.

However, the spin liquids do not require [(geometrical) frustration](https://en.wikipedia.org/wiki/Geometrical_frustration), for example, see [this post](http://physics.stackexchange.com/questions/64053/). In this sense,

1. What will be the examples of spin liquids with and without have (geometrical) frustrations?

2. What are the physical phenomena difference in terms of the two cases: spin liquids with and without have (geometrical) frustrations? For example, could the ground state degeneracy cause by different reasons? And the features of the gapless or gapped energy spectrum, and also the emergent e, m particles, photons, etc?

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