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=== Simplification of ADI to FADI ===
It is possible to simplify the conventional ADI method into Fundamental ADI method, which only has the similar operators at the left-hand sides while being operator-free at the right-hand sides. This may be regarded as the fundamental (basic) scheme of ADI method,<ref>{{Cite journal|last=Tan|first=E. L.|date=2007|title=Efficient Algorithm for the Unconditionally Stable 3-D ADI-FDTD Method|url=https://www.ntu.edu.sg/home/eeltan/papers/2007%20Efficient%20Algorithm%20for%20the%20Unconditionally%20Stable%203-D%20ADI–FDTD%20Method.pdf|journal=IEEE Microwave and Wireless Components Letters|volume=17|issue=1|pages=7–9|doi=10.1109/LMWC.2006.887239}}</ref><ref name=":8">{{Cite journal|last=Tan|first=E. L.|date=2008|title=Fundamental Schemes for Efficient Unconditionally Stable Implicit Finite-Difference Time-Domain Methods|url=https://www.ntu.edu.sg/home/eeltan/papers/2008%20Fundamental%20Schemes%20for%20Efficient%20Unconditionally%20Stable%20Implicit%20Finite-Difference%20Time-Domain%20Methods.pdf|journal=IEEE Transactions on Antennas and Propagation|volume=56|issue=1|pages=170–177|doi=10.1109/TAP.2007.913089|arxiv=2011.14043}}</ref> with no more operator (to be reduced) at the right-hand sides, unlike most traditional implicit methods that usually consist of operators at both sides of equations. The FADI method leads to simpler, more concise and efficient update equations without degrading the accuracy of conventional ADI method.
=== Relations to other implicit methods ===
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