"implies a challenge" is a grammatically correct phrase that can be used in written English.
It suggests that there is a difficulty or obstacle that is implied by something else in the sentence. Example: The new job opportunity implies a challenge for me to adapt to a different work environment and learn new skills.
In a city where the same man has been mayor for more than 21 years, often enjoying unanimous City Council votes in favor of his legislative proposals, fighting the status quo surely implies a challenge to Mayor Richard M. Daley and his allies on the Council.
This implies a challenge for researchers in the development of SON mechanisms [6-9].
Moreover, it implies a challenge to improve the diagnostic process of HF in nursing homes residents.
However, initiation of breastfeeding for mothers with diabetes often implies a challenge.
It also implies a challenge to physics that first hit me a few months ago as I listened to state officials in Texas explaining why undergraduate institutions should shut down inefficient parts of STEM, such as physics, so as to get more STEM graduates from efficient parts of STEM, such as biology (Reich, 2011).
Even then, this assertion of imperial authority did not necessarily imply a challenge to the supreme authority of the Ming, since the Jin dynasty of the 12th century had never ruled the whole of China.
Thus, networks imply a challenge to pyramidal, vertical or horizontal structures of an organisation; they foster communication and efficient work by means of information and communication technologies, (Pérez and Castañeda 2009, Steiner and Ploder 2011, Castells, 1998).
However, the flexibility and large number of different gate mechanisms [34] also imply a challenge from a control perspective, as it is not immediately obvious what are good qubit parameters, or good guess pulses.
The phenomenon of high resistance to commonly used antibiotics would imply a challenge for empirical treatment of pneumococcal infections in the area.
The fast growth of Radio Frequency IDentification (RFID) implies a deployment challenge, namely how to keep this technology scalable without renouncing security and privacy features.
