02202018

Added the class "Personal health and hygiene". Here is the Library of Congress class, on which it is based:
RA773788 Personal health and hygiene
"Personal health and hygiene" is a subclass of "Medicine", according to the Library of Congress:
Class R Medicine RA421790.95 Public health. Hygiene. Preventive medicine
Connected the OA class "Personal health and hygiene" to the IA class "Hygiene."

Added the class "Mathematics". Here is the Library of Congress class, on which it is based:
Subclass QA Mathematics
Added the class "Mathematics (general)" as a subclass of "Mathematics"
Connected the OA class "Mathematics (general)" to the IA class "Mathematics."

Added the class "Arithmetic". Here is the Library of Congress class, on which it is based:
QA101(145) Elementary mathematics. Arithmetic
"Arithmetic" is a subclass of "Mathematics", according to the Library of Congress:
Subclass QA Mathematics QA101(145) Elementary mathematics. Arithmetic

Added the class "Algebra". Here is the Library of Congress class, on which it is based:
QA150272.5 Algebra
"Algebra" is a subclass of "Mathematics", according to the Library of Congress:
Subclass QA Mathematics QA150272.5 Algebra
 Added the class "Trigonometry". Here is the Library of Congress class, on which it is based:
QA440699 Geometry. Trigonometry. Topology
"Trigonometry" is a subclass of "Mathematics", according to the Library of Congress:
Subclass QA Mathematics QA440699 Geometry. Trigonometry. Topology
 Added the class "Geometry". Here is the Library of Congress class, on which it is based:
QA440699 Geometry. Trigonometry. Topology
"Geometry" is a subclass of "Mathematics", according to the Library of Congress:
Subclass QA Mathematics QA440699 Geometry. Trigonometry. Topology
Added the class "Formal science". "Formal science" is a subclass of "Science" according to Wikipedia:
Wikipedia  Branches of scienceAdded the class "Mathematics". "Mathematics" is a subclass of "Formal science" according to Wikipedia:
Wikipedia  Formal scienceConnected the OA class "Algebra" to the IA class "Algebra."
Connected the OA class "Trigonometry" to the IA class "Trigonometry."
Connected the OA class "Geometry" to the IA class "Geometry."
Modified topic of IA identifier b28066017 from empty to "Personal health and hygiene."
Modified topic of IA identifier b23983735 from "Human physiology", "Health" to "Personal health and hygiene."