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Discover LudwigThe phrase "are previously known" is correct and usable in written English.
It can be used when referring to information or facts that have been established or recognized before the current context.
Example: "The results of the experiment are previously known to the scientific community, which adds credibility to our findings."
Alternatives: "have been known before" or "are already established".
Exact(29)
Terrorists are previously known to have planned to kill a soldier, and last year two men ran over and killed fusillier Lee Rigby near Woolwich barracks in south London.
Blue lines are previously known links.
However, if the expressions of the P fa and P d are previously known, then a threshold could be set according to a required error constraint.
The IEEE 802.11 wireless network deployed in that building has been used as the one over which the MU communicates with their APs whose positions are previously known.
It is just stated that the models, used for the design of the covert/model-dependent attacks, are previously known by the attacker.
All three signaling networks are previously known to play essential roles in embryonic lung development (Bellusci et al., 1997; Rajagopal et al., 2008; Tsao et al., 2008) (Fig. 1G).
Similar(28)
Alterra was previously known as Assisted Living Services.
Nigerian peacekeepers were previously known for violating civilians' rights.
He was previously known primarily for his successful modelling career.
The threat reports were more clear, urgent and persistent than was previously known.
Five of the paintings were previously known only from old installation photographs.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com