Found the following HTML validation problems:
Hessian.html:50:1 (Hessian.Rd:12): Warning: missing </ul> before </div>
Jacobian.html:50:1 (Jacobian.Rd:12): Warning: missing </ul> before </div>
Math.yac_symbol.html:51:1 (Math.yac_symbol.Rd:12): Warning: missing </ul> before </div>
Ops.yac_symbol.html:51:1 (Ops.yac_symbol.Rd:12): Warning: missing </ul> before </div>
as.character.yac_symbol.html:51:1 (as.character.yac_symbol.Rd:12): Warning: missing </ul> before </div>
as_y.html:46:1 (as_y.Rd:10): Warning: missing </ul> before </div>
cbind.yac_symbol.html:51:1 (cbind.yac_symbol.Rd:12): Warning: missing </ul> before </div>
deriv.yac_symbol.html:51:1 (deriv.yac_symbol.Rd:12): Warning: missing </ul> before </div>
diag-set.html:50:1 (diag-set.Rd:12): Warning: missing </ul> before </div>
diag.html:50:1 (diag.Rd:12): Warning: missing </ul> before </div>
grapes-times-grapes.html:50:1 (grapes-times-grapes.Rd:12): Warning: missing </ul> before </div>
lower.tri.html:51:1 (lower.tri.Rd:13): Warning: missing </ul> before </div>
prod.yac_symbol.html:55:1 (prod.yac_symbol.Rd:14): Warning: missing </ul> before </div>
rbind.yac_symbol.html:51:1 (rbind.yac_symbol.Rd:12): Warning: missing </ul> before </div>
set_output_width.html:46:1 (set_output_width.Rd:10): Warning: missing </ul> before </div>
simplify.html:51:1 (simplify.Rd:13): Warning: missing </ul> before </div>
sub-.yac_symbol.html:55:1 (sub-.yac_symbol.Rd:14): Warning: missing </ul> before </div>
sub-sub-.yac_symbol.html:51:1 (sub-sub-.yac_symbol.Rd:12): Warning: missing </ul> before </div>
subset-.yac_symbol.html:59:1 (subset-.yac_symbol.Rd:16): Warning: missing </ul> before </div>
t.html:48:1 (t.Rd:12): Warning: missing </ul> before </div>
tex.html:46:1 (tex.Rd:10): Warning: missing </ul> before </div>
upper.tri.html:51:1 (upper.tri.Rd:13): Warning: missing </ul> before </div>
with_value.html:54:1 (with_value.Rd:14): Warning: missing </ul> before </div>
yac_assign.html:50:1 (yac_assign.Rd:12): Warning: missing </ul> before </div>
yac_silent.html:46:1 (yac_silent.Rd:10): Warning: missing </ul> before </div>
ysym_ls.html:46:1 (ysym_ls.Rd:10): Warning: missing </ul> before </div>