Algebraists do it in fields. Algebraists do it in groups. Algebraists do it with multiple roots. Algebraists do it on field trips. Analysts Analysts do it continuously.
Analysts do it smoothly.
Analytic number theorists do it in the critical strip. Analytic number theorists do it on the critical line. Applied mathematicians do it by computer simulation. Applied mathematicians do it with a real world model. AI researchers do it heuristically when principled techniques fail.