Package: anita
Analytic Tableau Proof Assistant (ANITA)The ANITA is a tool written in Python that can be used as a desktop application, or in aweb platform. There is aJupyter Notebook(in Portuguese) that presents the Analytic Tableaux and ANITA concepts. The main idea is that the students can write their proofs as similar as possible to what is available in the textbooks and to what the students would usually write on paper. ANITA allows the students to automatically check whether a proof in the analytic tableaux is valid. If the proof is not correct, ANITA will display the errors of the proof. So, the students may make mistakes and learn from the errors. The web interface is very easy-to-use and has:An area for editing the proof in plain text. The students should write a proof in Fitch-style (seeAT Rules).A message area to display whether the proof is valid, the countermodel, or the errors on the proof.And the following links:Check, to check the correctness of the proof;Manual, to view a document with the inference rules and examples;LaTeX, to generate the LaTeX code of the trees from a valid proof. Use theqtreepackage in your LaTeX code;LaTeX in Overleaf, to open the proof source code directly inOverleafthat is a collaborative platform for editing LaTeXTo facilitate the writing of the proofs, we made the following conventions in ANITA:The Atoms are written in capital letters (e.g.A, B,  H(x));Variables are written with the first letter in lowercase, followed by letters and numbers (e.g.x, x0, xP0);Formulas with $\forall x$ and $\exists x$ are represented by $Ax$ and $Ex$ ('A' and 'E' followed by the variable x). For instance,Ax(H(x)->M(x))represents $\forall x~(H(x)\rightarrow M(x))$.Table below shows the equivalence of logic symbols and those used in ANITA.The order of precedence of quantifiers and logical connectives is defined by $\lnot,\forall,\exists,\wedge,\vee,\rightarrow$ with right alignment. For example:Formula~A&B -> Crepresents formula $(((\lnot A)\land B)\rightarrow C)$;The theorem~A|B |- A->Crepresents $((\lnot A)\vee B)\vdash (A\rightarrow B)$.Each inference rule will be named by its respective connective and the truth value of the signed formula. For example,&Trepresents the conjunction rule when the formula is true. Optionally, the rule name can be omitted.The justifications for the premises and the conclusion use the reserved wordspreandconclusion, respectively.Symbol$\lnot$$\land$$\lor$$\rightarrow$$\forall x$$\exists x$$\bot$branch$\vdash$LaTeX$\backslash\textrm{lnot}$$\backslash\textrm{land}$$\backslash\textrm{lor}$$\backslash\textrm{rightarrow}$$\backslash\textrm{forall x}$$\backslash\textrm{exists x}$$\backslash\textrm{bot}$$[.~]$$\backslash\textrm{vdash}$ANITA~&$\mid$->AxEx@{ }|-LicenseANITA is available byMIT License.Requirements:You must installrply 0.7.8 packageipywidgetsInstallTo install ANITA from Github, run the following command:pipinstallgit+https://github.com/daviromero/anita.gitTo install ANITA from PyPi repository, run the following command:pipinstallanitaANITAYou can run ANITA with the command line:anita-l"en"-i[input_file]ANITA in Jupyter NootebookYou can run ANITA in Jupyter Nootebook:fromanita.anita_en_guiimportanita
anita()ANITA in VoilaYou can run ANITA in aVoilàvoilaanita_en.ipynbANITA in your codeYou can import ANITA in your code (basic usage)fromanita.anita_en_foimportcheck_proof

print(check_proof('''1. T A|B		pre2. T A->C		pre3. T B->C		pre4. F C			conclusion5. {	T A		16.	{	F A	    27.		@	    5,6}8.	{	T C	    29.		@	    8,4}}10.{	T B		111.	{	F B	    312.		@	    10,11}13.	{	T C 	314.		@	    13,4}}'''))A Portuguese VersionWe have a portuguese version. In the portuguese ANITA syntax, useconclusaoinstead ofconclusion.Run ANITA withanita-i[input_file]Jupyter Nootebook withfromanita.anita_pt_guiimportanita
anita()Voilà withvoilaanita_pt.ipynbYou can import ANITA in your code (basic usage)fromanita.anita_pt_foimportcheck_proof

print(check_proof('''1. T A|B		pre2. T A->C		pre3. T B->C		pre4. F C			conclusao5. {	T A		16.	{	F A	    27.		@	    5,6}8.	{	T C	    29.		@	    8,4}}10.{	T B		111.	{	F B	    312.		@	    10,11}13.	{	T C 	314.		@	    13,4}}'''))