MathPHP\SetTheory\SetAxiomsTest::testAUnionAEqualsA PHP 메소드

    public function testAUnionAEqualsA(Set $A)
    {
        $A∪A = $A->union($A);
        $this->assertEquals($A, $A∪A);
        $this->assertEquals($A->asArray(), $A∪A->asArray());
    }