Sentence examples for the problem has been known from inspiring English sources

The problem has been known for some time.

The problem has been known for some time and acknowledged by all sensible people in Egypt, but apart from the rhetoric, no concrete steps have been taken to defuse it.

United Nations peacekeepers have been sexually abusing women and minors in Haiti who have been in need of basic food and medical supplies – and the problem has been known for almost a decade, according to claims in a draft report.

When questioned by Sen. Roy Blount (MO) how U.S. allies had dealt with sexual assault, since the problem has been known for years, Admiral Jonathan Greenert, Chief of Naval Operations, responded that was "something I should have done".

The problem has been known for several years, and more or less promising solutions have been suggested.

Although the problem has been known qualitatively for at least a century, we know of no previous statistical estimation of the size of the effect in a large-scale, high-stakes examination.

It was eventually revealed that the problem had been known to both city officials and the EPA for decades, yet residents were not warned and nothing was done to protect them or their children.

The solution to this problem has been known by health economists for decades: provider substitution [ 66].

While this problem has been known to be unsolvable since 1985, existing protocols were designed these past three decades to solve consensus under various assumptions.

In particular, because the number of all possible combinations of indicator variables for a given α is (left (|{mathcal {M}}|+2|{mathcal {S}}|right)^{|{mathcal {U}}|}), this problem has been known to be NP-hard [11].

This problem has been known about for some time, but the research highlights the scale of the issue.