public function testMaxNormLessThanEqualL1NormLessThanEqualSqrtNMaxNorm(array $V)
{
$V = new Vector($V);
$n = $V->getN();
$max_norm = $V->maxNorm();
$l₁norm = $V->l1Norm();
$√n_max_norm = $n * $max_norm;
$this->assertLessThanOrEqual($l₁norm, $max_norm);
$this->assertLessThanOrEqual($√n_max_norm, $l₁norm);
$this->assertLessThanOrEqual($√n_max_norm, $max_norm);
}