MathPHP\SetTheory\SetAxiomsTest::testAIntersectionEmptySetIsEmptySet PHP Метод

    public function testAIntersectionEmptySetIsEmptySet(Set $A)
    {
        $Ø = new Set();
        $A∩Ø = $A->intersect($Ø);
        $this->assertEquals($Ø, $A∩Ø);
        $this->assertEquals($Ø->asArray(), $A∩Ø->asArray());
    }