hvariant="italic">k</mi>
                                <mo>=</mo>
                                <mfenced open="{" close="">
                                    <mrow>
                                        <mtable>
                                            <mtr><mtd>
                                                <mrow>
                                                    <mi mathvariant="italic">n</mi>
                                                    <mo>⁢</mo>
                                 