>,<span class="std">Array</span>(<span class="num">1</span>,<span class="num">4</span>,<span class="num">9</span>,<span class="num">16</span>))
m dot m == Mat(<span class="num">2</span>,<span class="num">2</span>,<span class="std">Array</span>(<span class="num">7</span>d,<span class="num">10</span>,<span class="num">15</span>,<span class="num">22</span>))
m * <span class="num">3</span> == Mat(<span class="num">2</span>, <span class="num">2</span>, <span class="std">Array</span>(<span class="num">3</span>,<s