MathPHP\SetTheory\SetAxiomsTest::testIntersectionCommutative PHP 메소드

    public function testIntersectionCommutative(Set $A, Set $B)
    {
        $A∩B = $A->intersect($B);
        $B∩A = $B->intersect($A);
        $this->assertEquals($A∩B, $B∩A);
        $this->assertEquals($A∩B->asArray(), $B∩A->asArray());
    }