Changes

The definition of ''relation'' given in the next Section formally captures a concept that is actually quite familiar from everyday life.  For example, consider the relationship, involving three roles that people might play, expressed in a statement of the form "''X'' suspects that ''Y'' likes ''Z'' ".  The facts of a concrete situation could be organized in a Table like the following:

The definition of ''relation'' given in the next Section formally captures a concept that is actually quite familiar from everyday life.  For example, consider the relationship, involving three roles that people might play, expressed in a statement of the form "''X'' suspects that ''Y'' likes ''Z'' ".  The facts of a concrete situation could be organized in a Table like the following:

{| align="center" border="1" cellpadding="4" cellspacing="0" style="background:lightcyan; text-align:center; width:60%"

{| align="center" border="1" cellpadding="4" cellspacing="0" style="background:f8f8ff; text-align:center; width:60%"

|+ '''Relation S :  X suspects that Y likes Z'''

|+ '''Relation S :  X suspects that Y likes Z'''

|- style="background:paleturquoise"

|- style="background:e6e6ff"

! Person X !! Person Y !! Person Z

! Person X !! Person Y !! Person Z

|-

|-