Show that the function 
is concave upward wherever it is defined.
Definitions:
Heir
A person legally entitled to receive part of the estate of a deceased person, either by will or through intestate succession laws.
Specific Warranty Deed
A legal document that transfers real estate ownership, guaranteeing the property is free from claims and liens only during the grantor's ownership.
General Warranty Deed
A legal document transferring property ownership that guarantees the seller holds clear title and assumes responsibility for any title defects.
Restrictive Covenants
Legal agreements tied to a property that restrict the actions property owners can take, often used in employment contracts and real estate.
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