J = janetBasis M or J = janetBasis(C,n)
If the argument for janetBasis is a matrix or an ideal or a Gröbner basis, then J is a Janet basis for (the module generated by) M.
If the arguments for janetBasis are a chain complex and an integer, where C is the result of either janetResolution or resolution called with the optional argument 'Strategy => Involutive', then J is the Janet basis extracted from the n-th differential of C.
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The object janetBasis is a method function.