ex_4640_sol_Y09: bad solution, but 5 useful NOTES added by dcohen
ex_4640_sol_Y11: derivation of Y_x^{1m}, Y_x^{2m} unclear. Notation in (3) misleading.
ex_4640_sol_Y12: Parts1+2 sign in Y10 term wrong. notation \phi_{20}(r) cluttering and not useful. part4 - basis notation confusing.
ex_4640 V להשאיר בשיעורי בית
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