MathPHP\SetTheory\SetAxiomsTest::testAIntersectionBIsSubsetOfA PHP Method

    public function testAIntersectionBIsSubsetOfA(Set $A, Set $B)
    {
        $A∩B = $A->intersect($B);
        $this->assertTrue($A∩B->isSubset($A));
        $this->assertTrue($A∩B->isSubset($B));
    }