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Notice that the points (2,1) and (2,3) are on opposite sides of the line and (,) evaluates to positive or negative. A line splits a plane into halves and the half-plane that has a negative f ( x , y ) {\displaystyle f(x,y)} can be called the negative half-plane, and the other half can be called the positive half-plane.
The triple bar character in Unicode is code point U+2261 ≡ IDENTICAL TO (≡, ≡). [1] The closely related code point U+2262 ≢ NOT IDENTICAL TO (≢, ≢) is the same symbol with a slash through it, indicating the negation of its mathematical meaning.
The Samudera Pasai Sultanate (Malay: كسلطانن سامودرا ڤاساي ), also known as Samudera or Pasai or Samudera Darussalam or Pacem, was a Muslim kingdom on the north coast of Sumatra from the 13th to the 16th centuries.