MathPHP\SetTheory\SetAxiomsTest::testAUnionEmptySetEqualsA PHP Method

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