Although it may not be at all obvious given a polynomial over R how to decide whether it has a zero over R, it is a straightforward procedure to verify a solution that may be presented to us. Just plug the purported solution into the polynomial and evaluate it. Is...
CITATION STYLE
Blum, L., Cucker, F., Shub, M., & Smale, S. (1998). The Class NP and NP-Complete Problems. In Complexity and Real Computation (pp. 99–112). Springer New York. https://doi.org/10.1007/978-1-4612-0701-6_5
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