Once you've got them together, then you can compute the efficient portfolio frontier without the riskless asset.

当你明确了这些参数后，就可以算出没有无风险资产情况下的,有效边界了。

耶鲁公开课 - 金融市场课程节选

That would be a portfolio where you borrowed at the riskless rate and you put more than 100% of your money into the tangency portfolio.

在这种组合里,你可以以无风险利率借贷到一些资金,从而可以投入比你本金更多的资金,来购买切线投资组合。

耶鲁公开课 - 金融市场课程节选

Tangent means that it has the same slope, it just touches the efficient portfolio frontier for risky assets at one point, and the slope of the efficient portfolio frontier, including the riskless asset, is a straight line that goes through the tangency point, here.

相切意味着斜率相同，它与包含风险资产的有效边界,交与一点，而包含无风险资产的，有效边界，则是一条过切点的直线，切点在这里。

耶鲁公开课 - 金融市场课程节选