Emetophobia in which the phobic person will go to great lengths to avoid even potential situations that could even be perceived as "threatening". Emetophobia is clinically considered an "elusive predicament" because limited research has been done pertaining to it. The fear of vomiting receives little attention compared with other irrational fears. Frank M. Dattilio. "Emetic Exposure and Desensitization Procedures in the Reduction of Nausea and a Fear of Emesis." "Clinical Case Studies" 2.3 (2003): 199-210.</ref> The event of vomiting may make anyone with this peculiar phobia flee the scene. Some may fear someone throwing up, while others may fear themselves throwing
Dirichlet eta function the formula_19 function is then analytic for formula_15, a region which includes the line formula_8. Now we can define correctly, where the denominators are not zero, or Since formula_24 is irrational, the denominators in the two definitions are not zero at the same time except for formula_25, and the formula_26 function is thus well defined and analytic for formula_15 except at formula_25. We finally get indirectly that formula_29 when formula_13: An elementary direct and formula_32-independent proof of the vanishing of the eta function at formula_13 was published by J. Sondow in 2003. It expresses the value of the eta function