MathPHP\SetTheory\SetAxiomsTest::testCardinalityOfCartesianProduct PHP Метод

    public function testCardinalityOfCartesianProduct(Set $A, Set $B)
    {
        $A×B = $A->cartesianProduct($B);
        $this->assertEquals(count($A) * count($B), count($A×B));
        $this->assertEquals(count($A->asArray()) * count($B->asArray()), count($A×B->asArray()));
    }