In the book Applied Physics by P.K.Mittal, on page#25 under the heading of "Bravais lattice in two dimensions", a paragraph says,(adsbygoogle = window.adsbygoogle || []).push({});

"The number of point groups in two dimensions is 10."

My 1_{st}question is,

Then how many in three dimensions?

Paragraph further says,

"10 groups in two dimensions produce only 5 Bravais lattice."

What is meant by above statement?

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# Bravais Lattice in Two Dimensions

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