Question 975801
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Let *[tex \Large A\ =\ \left{-3.21,\,\sqrt{7},\,-\frac{1}{2},\,18,\,\frac{34}{2}\right}].  Let *[tex \Large A_{\mathbb{Q}}\ =\ \left{-3.21,\,-\frac{1}{2},\,18,\,\frac{34}{2}\right}].  And let *[tex \Large A_{\mathbb{Z}}\ =\ \left{18\right}].


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A\ \subset\ \mathbb{C}]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A\ \subset\ \mathbb{R}]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{\mathbb{Q}}\ \subset\ \mathbb{Q}]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{\mathbb{Z}}\ \subset\ \mathbb{Z}]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \